@addamasIt seems like you've already found at least one role-play to get involved in, so you're off to a good start.
Usually you just look for something that interests you. I'd say make friends too, since having a good group leads to better role-play experiences. It's a social activity, after all. There's a hang-out thread link in my signature if you'd like an example of where you can meet some people.
Anyway, lot of work to do, but if any questions or concerns come to mind give me a PM or something.