I totally agree with Craig. "No business can exist that sells nothing:" You are either selling a product or a service. For example, a person who is a lawyer is ofcourse selling his skills.
You may be under the mistaken impression that a service sells nothing. Consider your doctor, a lawyer, your accountant, or perhaps the people who pick up the garbage in your neighborhood. Then consider the electric company, gas company, phone company, and so forth, all of which are services. Of course there also are teachers, consultants, instructors, and so forth.
No business can exist that sells nothing. Services sell knowledge, information, efficiency, or time.
If you sell nothing, then you might try selling space for advertising, perhaps the pay-per-click (PPC) system.