Hello and welcome to Iwaku, Nio!
I'm Kitti and it's good to meet you.
This is absolutely the correct place to make yourself known, so hi. :]
Here is some stuff for you to help get you started on the right track:
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!
If you have any questions, please don't hesitate to ask.