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First time DM with no playing experience
(ttrpg.network)
A place where Game Masters, Dungeon Masters, Storytellers, Narrators, Referees (and etc) can gather and ask questions. Uncertain of where to take the story? Want to spice up your big baddie? Encounters? That player? Ask away!
And if you have questions about becoming a Game Master you are most welcome with those as well!
Rules
Here are a couple of articles that may help:
https://slyflourish.com/getting_started_with_dnd.html
https://slyflourish.com/top_advice.html