Hello, Miss Fate, and welcome to Iwaku!
I'm Kitti and it is very good to meet you.
Sooooo, who brought you here? :D
Hehe. Anyway, as you're new to us, I have some places for you to check out :
This is where you can sign up for the roleplays found in Modern, Scifi, Fantasy, and sometimes Mature. Generally, they will have you post a character sheet in their thread, a new sheet for each roleplay! You can also start signups for a roleplay of your own here.
This is where you can find jump in games, which typically have no sign up thread. You just start posting!
You can and should look around the rest of the site, too, of course but that should get you started in the right direction.
If you need any help, please do ask!