Get a job as a parts loader/green button pusher. Keeps your eyes and ears open and ask questions. But before asking the questions see if you can find the asnwer first yourself.
If you are lucky and your questions are not too annoying you might find someone who will act as a mentor.
You will need to get some proper training on manual machines and will need to go and get 'book learning' for CAD and CAM but if you have built up a foundation of exposure to the machines and have experienced what they can do even if you don't know how or why they do it you will get more out of formal training.
Plan on the whole process taking 2 to 4 years.
An open mind is a virtue...so long as all the common sense has not leaked out.