I believe it is a very good question. You are not in any way alone in seeing the money going round in music business and wanting to have a small part of that. As you are not alone, there are a lot of people in the same situation. Not making any money that is. A few has made it though. In order to make it, you have to both know your handicraft and stand out.
First, I believe you have to spend the time in learning the handicraft. If you want to sell your music you need to aim for a polished presentation. Learn how to create and mix sounds in your software. Learn how to write lyrics, or get a friend that can help you. Sing yourself or find a friend that can do it for you. Train, train, train. A good aim is to produce one song a day for a month. All of these songs will probably go to the waste basket. Maybe 10 will survive the first year.
Now, a year later, you will know how to do the mechanical things, what I call the handicraft. This is the time to start to find outlets for your music. In the same time as you have been training to learn the handicraft you have looked into what the markets looks like. Have you made contacts with a network of people, some in the business, some budding people like yourself, this is the time to start contacting them. There is a very, extremely very, small market creating music for the large global artists. There is as well a market for local bands, local DJ-s looking for original material. Or you could perhaps start DJ-ing yourself ( one example is the artist Avici that started that way ). Some music is sold as "musak", playing in shopping malls or elevators as background.
Regardless, I believe that the best results are made by people that really love what they are doing. Doing it mostly for the fun.