Independent Contractor Sch C efile

When I got to the end of don't my taxes. Turbo Tax online efile said that I cannot efile. I guess I'm doing a schedule C with write offs. My question is do I print the forms to mail in and send all my receipts and documents of write offs? I have milage expenses and other items such as office supplies. If I send in all my write offs where does it go? To state or federal?