If you do go into that Music Entrepreneurship program, the only advice I can give you is to do as many internships as you possibly can and network as much as you can while you are in school. Meet as many people as you can before you graduate. Try to find a mentor who can guide you, show you the ropes, introduce you to people.
If you want to do it, and you don't live in one of these areas already, plan on moving to NYC, LA, Nashville after you graduate or at least doing your internships there. Also prepare yourself for the nepotism and other weird shit which you will most likely encounter.
/u/IPYF's info and advice is accurate and good.
If you have interest in writing for pay, you're probably looking at commercial music, or what some people call Production Music, which is stock music used in TV, some films, commercials, and also sometimes for other clients like sports teams. Familiarize yourself with the music that's already used in these areas. If you're watching TV day to day, listen to that music that they use in shows on History, A&E, Food Network, MTV. Try and figure out what the demand is for.
The next trick is finding someone to buy your music. Most of the commercial music comes from the big libraries like APM, Extreme, Killer Tracks. Go to their websites and listen to some of the stuff they have. You may have to spend some money on equipment and software. Mics, ProTools or Logic, different plugins like Kontact or Omnisphere, instruments if you want to record live, etc. This can get expensive. Some plugins run in the 500 - 700 range.
If you want to learn more about licensing the stuff you've already written, check out this book which has a lot of info on the legal stuff involved.
I would never want to tell you not to do it, but realize that it's a rough road.