I know little more about commercial printers than that they cost way more than 1000 bucks. But maybe I have some useful tips for you.
Before you setup a business, gain some experience in your field. Make connections. As long as you are not making reasonable profit, there might be limited benefit in going though all the official hassle.
Go to maker spaces. Look at printers. Buy one. Get printing. Learn designing. Use the parts you print in your life. Improve, re-design them.
Making reliable and good parts on your own printer requires serious effort and dedication.
I have bought this entry level, very small printer a few years back.
Here (Australia) its called the “UP! Plus 2”, but Im pretty sure the same thing is sold under different names. It was around 2k at that time, its now around 1k. I would buy it again.
It took me a few months of experimenting to find the right filament and the right settings.
Im now using this stuff exclusively:
I estimate that I have printed 30-40kg of primarily small (1-10g) parts through that thing over the last 3 years.
I have spoken to many other printer people during that time, and ordered prints from various small, medium and large companies. Its a serial challenge to make good parts at a good price point. Its an even bigger challenge to make a profitable business out of “just” printing parts.
Most people that do 3D printing as a business, they do this as part of a bigger picture. Making parts is not the main goal, but it supplements and enables the main project.
What is your main project?