New player from Lordaeron and Icecrown

I currently plan on leveling a priest, warlock, and mage, but would like to know which classes are the most needed right now for raiding. I'd say I will be max level in a short time. I will also be looking for a NA guild to be raiding with. If you would be so kind as to reply to this post or contact me in game, My warlock's name is Xeuss. I am willing to fill whatever roll would be needed in raids, just looking for a guild with a chill community as I am an old timer.

Thanks,
Xeuss