Post one, interact, ask questions or yell "HELP, I HAVE NO IDEA WHAT I'M DOING!" in this post, and get a feel for the general flow of roleplay. Obviously, not everyone will get too many comments because of the small number of characters we currently have in play - but it's a nice time to figure things out without any pressure. Remember, in the immortal words of Douglas Adams: DON'T PANIC.
Enjoy! We'll see you over at oflastresort!
ETA: Also, don't forget that you can introduce yourself over here and that you should comment around on 1-2 other posts after you intro so every character can meet everyone else!