If you want to open a new business niche, you will have to search and inform yourself about the market. Open a business that is really rare in you city or state and go with the flow. For your business to go grow up you will new good and absolutely new ideas to hang on to. You will have to give the people something that they didn’t see before or they seen it in other countries. Be original and creative and all the money will come running to you.
Also, be really careful and if you don’t know that much about the market or business in general, you can always hire and expert in this field. Be courageous and nothing and no one will ever stop you!