After you've placed the order, we assign a PRO player with Stormwind Skychaser item in his inventory. He works according to the agreed schedule and will contact you in-game to trade you Stormwind Skychaser.
As soon as you receive Stormwind Skychaser you can learn it from your inventory, and it will become available to all the characters on your account. If Stormwind Skychaser is the Blizzcon promotion code, you will receive a digital code to redeem at your battle.net account page.