Are there any fairly simple Roleplays that I can sign up for that would be good for a beginner to learn about how it works?
My first RP was
gunpowder, which is about magic cowboys being assholes, and that's been really fun. The system is quite easy to understand, and the GM Gimmepie is very helpful with everything.
Stars of Sinnoh may be a good one if you want a pokemon RP in the style of the games. A big share of those players are new to RP'ing. Another RP, which seems to be quite active is
begin again, which is also GM'd by Gimmepie. A lot of roleplays are, haha. If you don't feel like joining an RP which has already started, I would look at maybe
The Race, which seems to be a smaller pokemon RP. There may be some others that peak your interest, so I recommend reading some of the other Out Of Character threads as well.
I made the RP names links :)
Also, have a free tip from me: SU stands for Sign-Up. It took me way too long to figure that out, haha.