Business cards
Go to a printer and tell it what you want to do. The printer should provide cuts of airplanes, etc. that you can include.
Chances are, you will hand them out to non-pilots who want to fly or private pilots who only understand their own certificates. Therefore, don't enumerate in excruciating technical detail each and every certificate and rating you hold. Put down your quals in layman's terms, something like "Pilot Services," "Single and Multi Engine," "Flight Instruction," "Ground Instruction," etc. Put on your address and all your contact information, e.g. phone number, cell number, e-mail, etc.
Print them on good business card stock, in an easy-to-read type face. Your contact information should be easy to find.
Hope that helps.