So, as a new tank, at what point should I really need to worry about proper crowd control from my team? So far, up till Stone Vigil, I've just been grabbing all aggro and keeping it, including unwanted adds, while being kept alive by healer.

Also, what classes have what kind of crowd control? As someone new to the game, I have no idea what the other classes can do. I hear one of them can put enemies to sleep. But that's about the extent of my knowledge.