I was always told to follow the rule that if you think of something that will make a ton of money, do some research, because someone has probably already thought of it and done it. If no one has, then your idea is probably flawed. It's the really small percentage of ideas that fit into neither category where you can make a lot of money, but that is incredibly small. Understand your probably of success before you start planning your dream of living on a beach for the rest of your life.