First decide where you want to market your music. The two main types of radio stations are commercial and non-commercial. Commercial stations have sponsors and run advertisements. Think of your top 40 hit stations, which are commercial stations. A non-commercial station is independently managed, usually having no sponsors or advertisements. College and university radio stations are usually non-commercial.
The next step is to hire management. Artists can always represent themselves, but it is more professional to hire an agent. Some people have a family member or friend serve as an agent in the beginning because management fees are expensive.
Put together a demo package. The package should include a copy of your song, a professional picture, a biography of the artist or band, a press release statement and your contact information
Call or visit radio stations. Ask about their policy for playing new songs. Mail or take your demo package to them in person. Some stations might be more willing than others to work with new artists. If the station manager shows interest, set a time to meet with him. Bring along multiple copies of your song. Some stations still accept tapes, however most prefer compact discs. Be professional when presenting the CD. This is where a manager comes in handy. Some stations are more apt to listen to a manger over the artist himself.
After the station says they will play your song, ask when it will debut. Promote your song with a debut party, advertisements in local papers, interviews or via the Internet on Facebook or Twitter. There are various Internet music marketing sites such as ReverbNation, where the artist and her music can be promoted