When starting off playing music, take every opportunity that comes your way to play with different ensembles - in all genres. Sometimes we put the blinders on, or close our ears to styles of music that may not be our favourite to play or listen to. It's been my experience that you can learn a lot from these experiences, and if you are going to make a living in the music business, more doors will be open to you.
Also, as a trumpet player, no matter what genre of music you play, take lessons from the best Classical Trumpet player in your area - learn the fundamentals.
