If it was easy, everyone would be doing it. The problem with building enterprise (highly-domain specific business) software is that to start, you need to know

If it was easy, everyone would be doing it. The problem with building enterprise (highly-domain specific business) software is that to start, you need to know that a problem exists. You won't find this information on the Internet or even in books. You need someone with very deep domain knowledge and the insight to recognize that a problem exists, that it has a possible solution, and that the solution has a larger market it can be sold to. The people who know all that, and are willing to take a risk and start a company around it are rare. If you're a programmer, find and work with them.