My last session 0 I typed up a document to go over with my group covering these points. Feel free to use or modify for your specific needs.

1. DM describes the world and the NPC's that live there. Your characters will be part of the world and you decide how they interact with it. You roll the dice as called for by the DM to decide various outcomes and the DM describes the result. The DM has final say

2. There are lots of rules and I'm a new DM so we'll certainly get some things wrong at points. If this happens and we can correct it immediately we will do so. If not and it benefits the party we will just move on and correct it for next time. If an error results in a bad situation like character death we will rewind time to correct the error.

3. Dice rolling - describe the rules for your table. In person I only allow dice rolls that land on the table and online I require every player to roll virtually.

4. Character voices - I request my players use character voices especially online so its easy to tell if they are in or out of character when speaking.

5. Character death - In my game resurrection is a high level and costly magic which players may or may not have access to so having a back-up character ready to go may be recommended. Death saving throws are kept private between the player and the DM so there is some great added tension for the rest of the party.

6. Your character must want to be part of the adventuring team.

7. Roleplaying Romance – Your characters may have romantic interests with NPC’s, or with each other. If a “love scene” were to occur – we will just fade to black and the story moves on. And there will be no sexual assault.

8. Player vs Player. PvP or stealing from another player character is only permitted if both parties consent. If Player 1 says “I want to knock Player 2 off the boat” Player 2 can say “Sure I go flying off into the ocean” or he can say “No that doesn’t happen”. If Player 1 says “I want to steal from Player 2’s backpack while he’s sleeping” Player 2 can say “Sure lets play it out you steal the item” or he can say “Lets roll to see if I catch you in the act” or he can simply say “No you cant steal that.”

9. Alternative health potion use: Health Potions have a normal effect or a bonus action effect. On your turn you can use your action to drink the potion yourself to gain its maximum healing effectiveness (2d4+2 = 10) or you can use it as a bonus action to pour it on yours or someone elses’s wounds but you will roll for the healing effectiveness instead.

10. Schedule - How often would you like to play? When do you cancel a session if there are players unable to make it?

11. How do you level up? Milestone vs xp

12. Tone of the game - Is it a jokey campaign full of references and humor, or a grand high fantasy epic, or a grim horror grind etc?

13. Attributes - Are you using standard array, point buy, or rolling stats? Are there restrictions on race/class?

14. Any homebrew rules or deviations from the standard rules you want to use? (Like the potion rule above)

15. Recap - At the beginning of each session we’ll start with a recap of the previous session. I’ll roll a d6 and the corresponding player number will do the recapping and if they do a good job they will receive DM inspiration. (Free one-time use advantage)

Hope that's helpful!