Find the Warchief's Command board in Orgrimmar.
Hi. I'm Ambassador Blackguard. <Blackguard looks down at a piece of paper in his hand.> On behalf of the warchief, I am honored to welcome you to Orgrimmar, <race>. <Glances at you, smiles unconvincingly, then looks back at the paper.> As a lifetime of adventure unfolds before you, be assured that... uh... You know what? I've been reading this same greeting all day. Enough's enough. Talk to your emissary and find out where you can adventure. Run along.