You can find Clans to join or create your own Clan using the Call of Duty: Advanced Warfare Companion App.
  1. Download the Call of Duty: Advanced Warfare Companion App to your device through your device's app store.
  2. Once the app is downloaded, log in to the app using your Call of Duty account.
  3. At the bottom of the home screen, select FIND & JOIN CLANS.
In FIND & JOIN CLANS, you will find Clans that your friends are in, Recommended Clans, and section where you can create your own Clan.