With my pally i leveled as protection, basically because finding a tank now a days is a pain in the butt. As for priests, shadow is the way to go...they do some major damage and you can also heal in a group if needed. As for help along the way, the only low level one I have is a 20-something hunter which I play off and on, don't know how much help that will be though. As for help from the guild on leveling, at 30-something on my pally I gave up and joined an alts guild until I was old enough to join the big guys at the upper 60's. Things might be a bit different now though since TBC isn't as new. Good luck to you.