Nice work. I'm not a CNC guy, although very interested. Here is a string that may be extremely helpful as you consider a business. I like my Laguna tools, great engineering, hold up well.
One member here, Gaffboat (Oliver Henry) has published a couple of good beginner books, one going through the terminology (lots of it), the other on design, which will be very important. They are published under Prof. Henry's byline, available on Amazon. Here are pix of the covers.