How to DM D&D for the First Time: A Beginner Dungeon Master Guide

To DM D&D for the first time, run a short published adventure or a one-shot for three to five players at level 1 to 3, read only the parts you need for the first session, and focus on three jobs: describe what the characters see, ask "what do you do?", and decide what happens next, using a die roll only when the outcome is uncertain. You don't need to know every rule. You need to keep the game moving and the players making choices.

This guide covers what to prep, how to run the table, the rules you'll actually use in the first session, and the mistakes new DMs make most often.

Table of Contents

• •What a Dungeon Master actually does
• •Before your first session
• •The core loop: describe, ask, resolve
• •When to call for a roll and what DC to set
• •Running your first combat
• •Improvising when players go off script
• •Ending the session well
• •Mistakes new DMs make
• •Tools that make your first game easier
• •Keep notes from your first game
• •Frequently Asked Questions

What a Dungeon Master actually does

The Dungeon Master (DM) runs the game for everyone else. You have three jobs:

1. •Describe the world. Tell the players where they are, what they see, and what's happening around them.
2. •Play everyone who isn't a player character. Shopkeepers, villains, monsters, the guard at the gate.
3. •Referee. Decide what happens when players try things, and when the dice get involved.

You are not playing against the players. Your goal is for the table to have a good time and to tell a story together. A villain can try to win, but you, the DM, are on the players' side.

Before your first session

Pick something short

For a first game, run a one-shot or the first chapter of a published starter adventure. Published adventures give you the map, the monsters, and the story, so you can focus on running the table. If you want something original, pick an outline from our D&D one-shot ideas or follow the one-shot writing guide.

Read only what you need

You don't need to read every rulebook before your first game. Read:

• •The adventure for the first session, twice.
• •The stat blocks of the monsters you'll use.
• •The basic rules for ability checks, combat turns, and the conditions that show up in your adventure (for example prone, frightened, or poisoned).

Look up anything else at the table, or make a call and look it up afterward.

Hold a session zero

Before the first real session, spend 30 to 60 minutes with your players talking about the game: what tone they want, what topics are off limits, how often you'll play, and how their characters know each other. Many groups make characters together at session zero. The free session zero checklist covers what to discuss.

Prep the first session on one page

Write down:

• •A strong start: the scene the game opens on, with something already happening.
• •Three or four possible scenes the party might get to.
• •Three secrets or clues the players can discover.
• •The NPCs they might meet, with a name and one detail each.
• •The monsters for any fights, with stats ready.

The free session prep template has a box for each of these.

Gather what you need

Dice, the character sheets, the adventure, a way to show where things are (a grid mat, a whiteboard, or a virtual tabletop), and snacks. Name a few extra NPCs in advance with the NPC name generator for when players talk to someone you didn't plan.

The core loop: describe, ask, resolve

Almost everything at a D&D table follows the same loop:

1. •You describe the situation. "The tavern is loud. A hooded figure in the corner is watching you."
2. •You ask the players what they do. "What do you do?"
3. •The players say what they try. "I walk over and sit at her table."
4. •You decide what happens. If the outcome is obvious, just say what happens. If it's uncertain and failure matters, call for a roll.
5. •Repeat.

Keep descriptions short: two or three sentences, with one sound or smell, and one thing worth interacting with. Then hand it back to the players. The most useful phrase a DM has is "What do you do?"

Spread the spotlight around. If one player has been talking for a while, turn to someone quiet: "Mira, what's your character doing while this happens?"

When to call for a roll and what DC to set

Call for a roll only when two things are true: the outcome is uncertain, and failure would be interesting. Walking through an open door doesn't need a roll. Picking a lock while guards approach does.

When a player tries something uncertain, ask for an ability check: they roll a d20 and add the relevant modifier from their character sheet. If the total meets or beats the Difficulty Class (DC), they succeed.

The SRD lists typical DCs, the same in the 2014 and 2024 rules:

For your first sessions, use 10, 15, and 20 for almost everything. A few more rules come up early:

• •Advantage and disadvantage. With advantage, roll two d20s and use the higher. With disadvantage, use the lower. If a roll has both, they cancel out and the player rolls one d20.
• •Natural 20s. A natural 20 on an attack roll always hits. On an ability check, it's just a high roll, not an automatic success, in both the 2014 and 2024 rules.
• •Passive Perception. Each character's sheet lists a Passive Perception score, which is 10 plus their Wisdom (Perception) modifier. Compare it to a hidden creature's or trap's DC to decide whether they notice it without anyone rolling.

Not sure which skill applies? Ask the player how they're trying it. "I look for footprints" is Wisdom (Survival); "I search the desk" is Intelligence (Investigation). Either way, a reasonable call made quickly is better than a correct one made slowly.

Running your first combat

Combat is the most rules-heavy part of D&D, so keep the first fight small: a handful of weak monsters, not a boss.

1. •Roll initiative. Everyone, including you for the monsters, rolls a d20 and adds their initiative modifier (their Dexterity modifier, plus any bonuses). Write the order down. An initiative tracker helps.
2. •Take turns in order. On a turn, a creature can move up to its speed and take one action (such as Attack, Dash, Dodge, or casting a spell). Some characters also get a bonus action. Each creature gets one reaction per round, usually an opportunity attack when an enemy leaves its reach.
3. •Attacks. The attacker rolls a d20 and adds their attack bonus. If the total meets or beats the target's Armor Class (AC), it hits and they roll damage.
4. •Hit points. Track monster hit points on scrap paper. When a character drops to 0 hit points, they fall unconscious and start making death saving throws.

Check that the fight is fair before the session with the encounter difficulty calculator. For a first session, aim for an easy or medium fight. Monsters don't have to fight to the death. Let them run away or surrender when they're losing.

Describe the hits, not just the numbers: "Your axe catches the goblin's shield and splits it in two" is more fun than "That's 7 damage."

Improvising when players go off script

Players will do things you didn't plan. That's the game working, not failing. A few tools help:

• •Say "yes, and" or "yes, but." If a plan is reasonable, let it work, maybe with a cost.
• •Ask the players. "What does your character know about this temple?" turns their backstory into your prep.
• •Keep a list of spare names, places, and hooks. When players wander into an unplanned shop, read the next name off the list. The plot hook generator and tavern generator are quick to pull from at the table.
• •Move your prep. If the party skips the cave you planned, the clue that was in the cave can be on the bandit they meet on the road instead.
• •Take a break. "Let's take five" buys you time to think. Nobody minds.

When you're not sure what a rule says, make a fair call, say you'll check it after the game, and move on. Stopping for ten minutes to search a rulebook kills the energy.

Ending the session well

Stop at a natural break or on a cliffhanger, about ten minutes before you need to. Then:

• •Ask each player what they enjoyed. You'll learn what to do more of.
• •Hand out experience points or announce a level-up if it's time.
• •Tell them when the next session is.

Then write down what happened, while you still remember.

Mistakes new DMs make

• •Over-preparing. Detailed plans for things the players never see. Prep situations, not plots.
• •Treating it as DM vs. players. Your job is to challenge the party, not beat it.
• •Calling for too many rolls. If failure isn't interesting, let them succeed.
• •Long monologues. Keep descriptions short and hand the scene back with a question.
• •Fearing rules mistakes. Every DM gets rules wrong. Make a call, keep going, fix it next time.
• •Forgetting the quiet player. Check in with each player at least once an hour.
• •Starting too slowly. Open with action, not a long history lesson.

Tools that make your first game easier

• •Dice roller for online games or when dice go missing.
• •Encounter difficulty calculator to balance fights.
• •Initiative tracker and condition tracker for combat.
• •NPC generator and name generators for unplanned characters.
• •D&D conditions list to look up what blinded, grappled, or stunned do.

For more, see our list of the best DM tools.

Keep notes from your first game

Write a short summary after every session: what happened, which NPCs the party met (and what you named them on the spot), what the players promised, and what threads are still open. It turns your first one-shot into a campaign if the table wants more, and it's the best prep for next session. The free session notes template has sections for each.

Taking notes while running the game is hard, especially the first time. Loreify records your session (in person through the web app or on Discord through the bot) and writes the recap, NPC list, quests, and quotes for you a few minutes after you finish. There's a 7-day free trial if you want to try it on your first game.

Frequently Asked Questions

How do I start being a Dungeon Master?

Find three to five players, pick a short published adventure or one-shot, and schedule a session zero to make characters together. Prep only the first session on one page: a strong start, a few scenes, some clues, and the monsters. Then run it and learn as you go.

Do I need to know all the rules to DM?

No. You need the basics: ability checks and DCs, how a combat turn works, and the conditions that come up in your adventure. Look up the rest when it comes up, or make a fair call and check it after the game.

How many players should I have for my first game?

Three to five is easiest. With fewer than three, the party struggles in combat. With more than five, turns get long and it's harder to give everyone the spotlight.

What level should players start at for a first game?

Level 1 is simplest for new players, since the character sheets have fewer options. Level 3 works well if the players already know the game, because characters have their subclass and are harder to kill.

How long should my first D&D session be?

Three to four hours is typical, including breaks. For a first game with new players, three hours is plenty. Plan for it to run slower than you expect.

What do I do if players do something I didn't plan for?

Let it happen and adjust. Move your planned clues and encounters to wherever the players went, ask players to fill in details about their own characters, and keep a list of spare names and hooks. Calling a five-minute break to think is fine.

Related: D&D one-shot ideas · How to write a D&D one-shot · D&D campaign ideas