The Microsoft Advertising Pub Center will allow you to create two types of Advertisements. 1) 480x80 XX-Large banner ads, and 2) 300x50 X-Large banner ad.
1. PUBCENTER > APPLICATION(S)
First, register your Application at the Microsoft Advertising Pub Center web site – the Ad Control requires the Application Id.
Any web page, Windows Phone 7 application, Windows 8 application, or other published medium in the pubCenter system where advertisements can appear.