I'm a music producer and really don't have any experience in that area. I've done tons of industrial films, some TV and one feature, but I wish someone would have told me to move to LA or NY or wherever that is the best shot of getting that experience. I have one friend that was doing that. He is a great musician/guitarist and has a classical degree but that didn't help him. He moved to LA and got a job with a big film company in the "music preparation room". Basically he made copies and taped the music together that they would use in sessions for film scoring. He did a good job and very, very slowly moved up the ladder to music supervisor.
Sorry I'm not more help.