It appears you don't know the UL/CSA safety specs. Without those, you are truly lost. And you won't learn them in a day or two. Do not sell anything with any voltages greater than 42V. Design to UL/CSA specs, advertise it thusly and be certain you actually did that correctly. Many labs around the country would do a test suite for you for a reasonable price, and then you could use those in your adverts too. Note that many cities, counties and town around the country won't allow a product to be sold unless the safety approval is in place, though. All of Ca, NYC, Chgo, DC and FL are a few of them. Also be certain that every component has a UL or CSA listing also. It doesn't guarantee you'll USE them correctly, but if you do, at least the components are listed.
Burn down my house and yes, you have a guaranteed law suit on your hands. But then, I would never purchase anything that was not UL approved, including kits. It's difficult to get approvals on kits, too. Lot of hoops to jump thru.
Go talk to UL; they will talk to you and give you some good info.