If there was one thing I would recommend it would be "listen to all the music you can". Jazz, hip hop, heavy metal, pop, classical, ska, punk, whatever - music really is just that - music, and the more you listen the better you can "feel" it. I know it sounds crazy but it works! (Maybe it's just me...) Anyway listening to music is fun and helpful and might inspire you and give you insights into compositional techiniques and stuff.