Work from what you know. And that is going to give you your edge over everyone else. As Jack Trout says, "differentiate or die." You need to have your product be unique. What sets it apart? If you start with your knowledge, you're different. Everyone is unique, so build that into your product. What do you do that is unique? What is it that sets you apart? Do that for your product. Don't stop there; always put it in front of the customer for feedback. Get it in front of your customers, get feedback and see what they say. When you follow that rule you will have a product that is unique, differentiated, and that customers want.