To open a Chipotle franchise the first step is to apply for one. Chipotle does not grant many people franchising rights. They prefer to own and operate their own restaurants. They only have 8 stores that are franchises and the rest are owned and operated by them.
Chipotle is not looking to open Franchises at the moment it seems. While they are open to suggestions as to good places to open them. My suggestion if you are in a position to is to contact them and present what you can offer them.