I have seen way too often low-level RP'ers thinking that if the gear matches their description, they are good for RP, but NO. You AREN'T. Think of this as a small rant/noob guide about RP'ers who, even after reading guides, still don't know anything about RP, and what they do so terribly wrong. (Remember: This is IN-GAME RP, not Forum.)
1. Gear
You are in control over what your character looks like. If you purposefully make your description roughly match that of an easy-to-aquire item in WoW (Say, Vendor Gear that costs, like, 10 silver), that is lazy. Appearence is (mostly) everything. If you have vendor gear, or gear you can easily aquire through the newbie quests, equipped while you RP, you will look like you didn't care about your character, and will have a less chance to have a RP session with someone. Good gear would be gear that took a while to get (Valor/PVP/Justice/etc. point gear, 1000+g gear, low-chance drop rate, etc.) but, they don't need to be SO difficult. Maybe through a certain proffession, Auction House, or maybe even a quest reward that is for lvl 30+. Not saying that all people with terrible gear are bad or good, i'm just saying put a little more effort into how you look. Besides, if everyone wore the same gear, the only thing that would distinguish us between each other would be out faces. So, be creative!
2. Description.
Okay, if your leveling, and not RP'ing, it's fine if your description/history says WIP (Work In Progress). DO NOT DO THE OPPOSITE. You can say "RP to find out" (As lazy as that is), but i don't want to see things like, "What's on him/her" or anything of the kind, because that's just so uncreative. If you want to know how to describe someone, read this forums "Character creation" page. Same for History. Don't leave out any details.
3. Gear Cont.
Forgot something. Starter Gear. If you use it in RP, you are the most uncreative and lazy RP'er in the universe.
And that's my little rant. Hope you enjoyed, and learned something through this expirience. Please, RP correctly or you will be highly disliked by me and the RP community.