Mafia: general discussions.

This will be my first time GMing, so I'm still not entirely sure what to do. I'll be improvising as I go.

Why? I've GMed before and advise you to keep it as simple as possible for yourself and the players. There's no need to reinvent the wheel.

That's definitely not my problem.

In that case, it shouldn't be your problem if someone doesn't have time to sign up when a game suddenly opens.