Well, for starters, here's a good link for you to check out:
Doomed Heroes Guide to PBP Gaming
It'll give you a lot of great pointers!
Cheers!
You're welcome!
BTW: Shanosuke is looking for more recruits for his new PBP. I can't promise that you'll be selected (I can't promise that I'll be selected), but he's interested in more submissions.
The thread is here: Xanxiou’s Crystal
He's going to go over the submissions this weekend, so whip up a character and submit him! (You can post your interest and a basic concept first, but you'll want your character ready for him to peruse this weekend.)
Cheers!