Bounce your business ideas around. Speak with family, friends and even competitors about what you have in mind. It does not matter if they do not understand well your business or market; they can point to gaps and new opportunities. In addition, most importantly, listen to their questions! Their doubts or lack of understanding might highlight some ill thought aspect of your idea. It is very important to speak up; no one can possibly see all the aspects and nuances that affects running a business.