Hi, Zella!
I've been RPing for 10 years total now...since I was 12!! So I know how it is.
I hope you've wasted no time in hopping around the site and getting to know the place. If you ever need help with anything, feel free to PM me or pop into the chat to look for me. I'll be more than happy to help or answer any questions. ^^
In the mean time, the best place to start when looking for an RP is the Out of Character forum. That is where most people advertise their RPs and state rules and such.
Also, you are, of course, welcome to start your own if you can't find something to your tastes!
Again, welcome!!