To make sure you're truly not just reinventing the wheel, you'll need to do some research. Once you figure out what you want your company to do, you can start to look into who your market might be - that is, who is most likely to buy from you. Then go talk to those people. What specifically are they looking for? And better yet, what do they need that current companies aren't doing for them? What problems do they have that you could solve?
Then do some research into your competition. What companies are already trying to solve this problem and how are they doing it? What are they missing, that you could provide?
It's worth working in your chosen field for a while, to learn more about the industry. That way, you can get a better idea of what you want to provide and how you might do it. You'll also make connections with people who may be able to help you out along the way.