In my opinion, a tank(paladin,shadow knight, warrior) is a horrible first toon. They're the MOST equipment dependent and these days if you're not twinked(geared way out of your class by another character) you're usually below people's expectations. I would suggest a class that's not so essential, so you can grow with out geting hassled too much.
I suggest you don't be a warrior, paladin, shadow knight, cleric, druid, shaman or enchanter, untill you learn the game. People depend on these classes for a LOT.