How are you doing, Breathe? Well, registering your cnc router business is no different from that of establishing a regular business. Here in the US, you have to go to your office of the secretary of state and register your business name. After doing this, you fill in your tax identification details from the office and pay the required fees.
If you need to make it a limited liability company (LLC), there are some additional steps which you have to go through, and that is it!