+1 !

OP, buy a printer, any printer (kit or assembled), but don't spend more than $500 or so. Then spend some time fiddling with it, tuning it, calibrating it, upgrading it, testing different materials, playing with different slicers and software, and cursing it. After a year or two you will understand what kind of printer you will need for your business, should you decide to proceed further.

Best of luck!