***You need to read.***
Try and find demo versions of programs or use free stuff to start off with, like Fl Studio's demo, or Reason's demo. You can also take a look at a tutorial written by Rig on how to make free music.
Check out Rigs profile, he's got cool stuff there. Like disss!
Or you could be a dirty rotten fl studio stealin' whore like everyone else.
Your choice :D
I'd check up on Rig...
Fl Studio is a place to start. If you've never worked with daw's (Digital Audio Workstations) then it'll teach you the basics of audio and midi. Don't limit yourself to just that program once you start to get the hang of it though. It's just a taste of some of the kind of programs that are out there to help you realize your ideas.