Good luck!! A couple more questions if you don't mind.
so, are you selling the machines or the stamps? or both?
Does your course cover the legal and ethical problems of copying or using someone's intellectual property, trademarks, or logos? I see this a lot with the new lasers, printers, and such. Seems folks think because you buy a machine that makes copies and can google, then it's ok to copy or use anyone's work and sell it without permissions.