Not bad
pretty good for a first movie......
some problems with:
-lack of dialog
-annoying music loop
-lack of backstory
good potential though!
in terms of music programs you could try:
apple soundtrack; sonicfire; band-in-a-box...
but none of these are free programs.
also: if you are very good at composing from scratch you COULD try your hand at finale but i wouldn't reccomend it to you if you dont know music theory; its kinda hard
good luck with your little series