There's only really 2 active Alliance twink guilds and those are <ftp bullies> and <Stuck at Graveyard>. Pretty chill people in both from my experience.
@Dform Hmmm... so you're saying that end game is a joke, which means twinking must be a super joke with even less to work with, then brag about how great you were twinking? o_O
If I had to choose one character to go F2P with, I'd either go Hunter or Druid. I personally just roll hunter, but a Druid is nice because it caters to range dps/melee dps/healer specs if you ever get the itch to play them. Plus FC'ing.