I would honestly just start at the top of the forum and start reading requests. Keep reading requests until you find one that just jumps out at you, that you think you'd enjoy. After that, give it your best shot- there should be some people around here that are willing to work with you to help develop your RP and writing skills.
Mostly it's just going to take time and hard work, but it'll be a really fun time and really rewarding work.
Anyways, I hope we both get approved- good luck to you!