Starting something from home always has much less overhead and the convenience of working the hours you want to work. You can also start part-time while keeping your income from a job while you build it up. In addition to the overhead, a brick and mortar business requires that you or someone staff it during set business hours. Feel free to contact me if you d like more ideas.
Work in a few stores that do what you want to do.Go there and keep your eyes open, both as to the stock they sell (where did they get it, how much, mark-up, shrinkage, sales, etc...) and their sales technique (if any). Learn what they do right (and wrong) Keep notes.Rinse and repeat until you have a good idea of the industry. Get a network of like minded people. Discuss ideas with your network.
You can try transation processing or merchat accounts you get $500.00 for a new customer that needs equipment and 1 1/2 % every month on their total card sales!Check out this website http://www.bankcardempire.com/359792