1. Complete the Garrison Campaign chapters listed below:
The Warlord's Council
Darktide Roost
The Ring of Blood
Bloodmaul Compound
The Exarch's Call
A Strike at the Heart
The Sargerei
Iron Siegeworks
The Fall of Shattrath
Broken Precipice
Heart of the Breakers
Primal Fury
2. You need to provide your account.
3. ETA: 8 - 12 CDs.
Tips: You get a Garrison Campaign quest every week.