I'M NEW
Well, the first place to check out is "Wanted - Players". This is where GMs list games they are running that have spots open for new players.
If you can't find what you want there, you can go to "Wanted - GMs", where you can ask for someone to run a specific game for you.
If you're thinking of running a game, "Game Proposals, Input, and Advice" is where you can propose your game, ask questions and generally see if there is interest in what you want to run.
If you have more questions, just ask, there are loads of helpful people here.