HMM! If you're going to try to sell reloaded or "remanufactured" ammo, you will need to have a LOT of liability insurance! You'll need to shell out a LOT of bucks for fully-automated COMMERCIAL-sized reloading equipment, and have an "in" with the wholesalers who carry bulk bullets, gunpowder, primers, casings AND packaging materials.
If you're going to sell FACTORY-loaded ammo, you'll be competing against the already-established businesses....including the huge "chain"-type stores.
You'll have to find a location that can be licensed for storing "explosive" components, get a valid business license, have an EIR (Environmental Impact Report) made, and acquire an FFL for loaded ammo storage/sales.
Internet sales? You'll need computers! You'll need all of the associated hardware for "safe" on-line sales. You'll need to spend a few bucks for advertising. You'll need FAX machines. Oh, and you might even NEED to hire an attorney, on "retainer", if you make a "goof" by sending loaded ammo to someone who is "restricted".
You'll probably need to buy several cases of aspirin, for all of the business-related headaches you'll get!
Other than all of those things, I figure that it should be smoothe sailing for you! Just don't count on making a PROFIT for awhile!