You need to consider a lot of things sir. First what kind of business are you interested in? where you know you can enjoy doing. Second, what business you think are the people you belong are most interested with, where you think you can cater them. Next, consider your location, are you near a school or offices, market , church or park? Then you can also conduct a survey and observe your community. It is different thing if you invest in online businesses, that you need some research.