Hello there, newb friendly newb!
Welcome to Iwaku; I'm Kitti and it's good to meet you.
WE ARE FUN. MORE CONVICTION, DIANA.
Anyway, since you're new and all, I have some AWESOME links of SUPER FUN for you.
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!
These are places that are particularly helpful to roleplaying but you can and totally should look around for yourself at what we have to offer, too!
If you have any questions, please do ask. :D