Were you able to play the game before? If no then that might be an issue with match making. Match making is how you are being paired up with players. Connection and DLC ownership are reasons for matchmaking.
A support case was created for you and you should be contacted shortly by a Customer Support Representative, if you haven't been already. You can view and update your case at the Activision Support website. After logging in, go to "My Support" then "My Cases".