Magikmini,
Well, you could use Acid Music - a really straightforward and intuitive sequencing package which lets you paint in loops, from samples that you load into it.
If you've got some of your own samples you'll be putting together ideas within 5 minutes of installing.
Might be good to by a half decent soundcard at the same time, as you may be disappointed with your tunes listening to them on a bog-standard one. An SBLive isn't a bad start, and it has a sampler function (Soundfonts) that might be useful to you if you get into it.
Hope that helps mate,
Matt
