[akuji1993]

Adding to this:

First thing should not be finding out what what your customers want.

First thing should be finding out IF THERE EVEN ARE CUSTOMERS for your product.

A product idea that doesn't have any market won't be successful. So find out if there are people who have a problem that can be solved, then try to solve that problem. Additionally the problem has to be annoying enough so people are willing to pay to make it go away. If you have those two, it's a great start.