Music is one of the most difficult bits I find.
The music in my first few jams was, let's just say not great. After figuring a few things out, and some practice playing about with LMMS, different plugins and exercises taking sheet music and translating it into LMMS, I think I'm starting to get the hang of it. Now some pieces I make, people look at me and say "you really made that?"
I hope you get it all working.