yogsloth: The best thing to do:
Observe at least one game in real time without participating. I observed two (#22 and 23) completely silently before signing up.
Go back and read four-six old games to see what worked and what didn't. I'm happy to give some recommendations here on GOG.
Play at least two-four games where you go deep.
Sign up as an assistant mod and complete a game that way.
THEN you can feel comfortable moderating.
Or just completely wing it!
I barely read the games I'm actually playing, never mind any of the old ones... And I only followed one game before signing up (and that was technically by accident as I stumbled across Ix's werewolf game on the forum and became intrigued)
Though I have assisted modding for two games (kind of), though admittedly one hasn't been played yet...