I know this is a somewhat late reply, but i've found using a Prot Paladin to queue as a tank for LFD(on a different server, but one that's merged with your main one) usually ends up being the best / quickest option, then once you get to 85 / 90, grant your levels to the character you originally wanted to run with your group(If you're using RAF). I always do this simply because i've found that tanking through LFD queues with a Prot Paladin is the easiest with their rotation, and aggro holding / survival, they don't require much attention tanking up through the 1-85 instances.