My first ISBoxer team was all hunters. They are level 50 right now and have been able to do every level appropriate dungeon.

The point of this is, while you're learning, it's easiest to play all the same class with the same spec. Also, with hunters, you send pets in and shoot from a distance. This lets you learn the basics of multiboxing in the least complicated manner. You can later graduate to more complex teams/playstyle IMO.