I have to agree with the other members about the publishing aspect. Some really good ideas to break into the business would be;
Try entering in a composition contest
This is a great way to get noticed, esp. if you place in the third or runners up position. It also exposes you to other composers, which is a great way to network.
Start Arranging first
You can't really expect to just jump of the proverbial boat and say "Here is my work!!! Buy it now!!" and have people take you seriously. You have to slowly build a reputation, acquire contacts and regular buyers of your music. The best way is to arrange music for people. It doesn't have to be a master piece/magnum opas, just a little something for your local high school, church or anything else. That will get the word out about you talent to work with music. Then you can gradually make the cross-over to compositions.
Create a Website/Business Cards
This is the absolute best way to get business, and keep business. If you tell someone that you have some amazing compositions, and they should really check them out sometime......but you forgot them at your house, or maybe trying to explain what going from a Am6(9) to an F half dim. sounds like is a little difficult....then what? You have to have a central location where the potential customers can go and look around and contact you if need be. Also, a website is a great place to catalog your pieces. Make it look professional too. Would you buy something from someone who doesn't have their act together? I didn't think so.
These are just some common knowledge things that could possibly help.