Friend,
I can tell you it's a very tough, very competitive and very unforgiving business. You'll need a large line of credit or a large bankroll to even get started. You'll need manufacturer contacts, a target customer base, a location without too much competition or previous saturation and a very understanding family.
I highly recommend going to work for someone already in the business to see what it's really about before investing a lot of time and money.

I really hate to discourage and disappoint you, but I'm giving you the reality of it.
Whatever you decide, the very best of luck to you
sh