CG Music can be an expensive past-time especially if you are into Orchestral scoring etc, try something like Fruity Loops or the like first, to get the hang of using looping (Acid Pro is good for this too, that's what I learned on), it's free and pretty easy to use. If, however, you want to get onto the more orchestral stuff, you have to start looking at things like VST's and Cakewalk/Cubase/Pro-Tools etc, and then your costs go into four figures.
As for modelling, like coding, it's really a question of sitting down and
doing it, it's really the only way to learn what is going on
