Speak with Archmage Khadgar at the foot of the Dark Portal in Blasted Lands.
<name>, is it? I'm glad you're here. We can use every able-bodied <class> that we can get.
I am assembling a coalition of Azeroth's strongest to step through this Dark Portal and stop the Iron Horde invasion. This may be the only way to save Azeroth.
Will you join us?