You can advertise in any number of music trades like Billboard or contact organizations that deal with music industry employment (NARIP, for one) to find someone to handle your publishing catalog (if you’re willing to pay a salary). Publishing administrators wear many hats, from trying to place music to collecting money to making sure the paperwork is up to date. Administrators find money in anything that uses music like film, TV, advertising, web sites, etc.
Each performing rights organization has its own fees for setting up a publishing company and many impose an annual charge or collect annual dues. BMI, for example, charges a one-time fee of $150 for individually owned publishing companies and $250 for partnerships, corporations (including sole stockholder corporations) and limited liability companies.
A publisher’s main function, whether it’s an individual or a corporation, is to exploit (get your songs recorded, performed, etc.) your songs and collect income from that exploitation. A publisher works with producers, directors, music supervisors, record companies, commercial production companies and trailer houses to negotiate fees for licensing your music for artists to record and for use in movies and on TV, in advertising and other outlets.
Technically, your song is copyrighted as soon as you finish writing it. However, you’re going to want to register that copyright to protect yourself in case someone tries to use your song without your permission. You can download copyright registration forms from the Copyright Office at http://www.copyright.gov/forms, or you can…