If you have not yet used the mark in commerce, but plan to do so in the future, you may file based on a good faith or bona fide intention to use the mark in commerce. You do not have to use the mark before you file your application.
An "intent to use" application must include a sworn statement (usually in the form of a declaration) that you have a bona fide intention to use the mark in commerce. A properly worded declaration is included in the USPTO standard application form. The applicant or a person authorized to sign on behalf of the applicant must sign the statement.