How can I become a successful electrician from no experience at all?

I am currently in the military, and I have been thinking about switching to the Army to become an Interior Electrician (21R). I would like to retire with 20 years at the age of 41, then start my own company once i get out. Although that sounds like a realistic plan, it may not be that easy. If someone with electrical experience can give me some beneficial advice, I would highly appreciate it.