I probably don't need to say this, but for all you would be GMs out there, post your sign-up threads here. I would also suggest playing a game before creating your own, but it's up to you.
As for rules, there's only one major one. The GM of any given RP has absolute control of that RP, short of a moderator stepping in. They can choose to kick you out and they can choose to let you in. If you feel you've been treated unfairly, shoot them a PM. If that doesn't resolve the issue, then you can come complaining to me.
All other rules vary from game to game and are at the discretion of that game's GM.
Nice legs, daisy dukes, makes a man go