Hi David
Welcome to the forum
I'm trying to get into the film & TV music game too, and have made a little headway simply by submitting my work to publishers who compile MCPS music libraries.
They're mostly based on you writing the music on spec, and then producers/ whoever paying a licensing fee for usage, plus of course you'll get broadcast royalties.
Do a google search for production music publishers or production music library and you'll find way more than you can handle. Then it's just a case of a little research finding the ones you think are a good fit for your music.
Once you're established, you're in with a chance of being commissioned especially, but I think this is pretty unheard of for new composers. Also, the market is pretty saturated, but not to the point of no hope.
Hope some of that helps.
Tone