Jimbo, My advice to you would be to FIRST learn how to build bikes BEFORE you start trying to sell them!
It would be real easy for someone to get hurt very badly because you are a inexperienced builder!
Start off by building just one bike for yourself & learn how to make it SAFE & RELIABLE, then sell it & build another bike & repeat the process...
Over 1/3 of my little motorized bicycle business has been fixing or finishing other peoples motorized bicycle builds! It looks easy to build these bikes, (but it really isn't!!)
Good luck & remember, build 'em "safe & reliable"!