Don,
Have a look at Community Colleges, State Colleges, Trade schools within your area. and see what they have to offer.
Look at the mechanical engineering curriculums for courses offered.
A lot of community colleges offer certificate programs in continuing education. In many cases prereaqusit courses are required.
You may want to research different industrial employers that utilize cnc machinery in their manufacturing. Sometimes they offer / have their owne on line courses
to be done by the employee. So you could pursue becoming a cnc operator while working there and move up.
Network with people to find folks in the trade. Ask the right questions, be thank full for any advice given, and if done properly you may be surprised on the results.
These days I echo the following:
YOU CAN HAVE ANYTHING YOU WANT, BUT ONCE YOU SELECT IT, YOU MUST PAY THE PRICE!
Good luck,
RICH