Direct sales, no preorders or Kickstarter campaign, from comments the OP made at the beginning of the thread.
Kickstarter us not a slow delivery ordering system, it’s a speculative investment scheme (not knocking @bar , who did an amazing job) that might result in a “reward”. Preorders aren’t a lot better, got badly burned on one from the now defunct QuBD.
The OP will be offering a developed product for sale, with the accompanying (but not absolute…) obligations and legal protections and deserves extra credit for doing things that way.
OT: I’m amazed at the number if people who start screaming “Lawyer” and “arrest them” when a KS project fails to deliver. For random examples look at Peachy Printer (founder stole the money to build his house, no legal repercussions) and Tiko3D, ZionEyze (sp? founders went elephant riding in Thailand iirc), etc. @Metalmaslow wins extra credit and is off to a good start.