You may have used loop-mased music creation software, but if you really want to get your hands dirty you will want to make your own loops & beats from scratch! Now, by "scratch" I mean samples, either purchased professionally, downloaded for free off the Internet, or created by noise-producing instruments you record yourself. I'd recommend downloading as many free samples as you can to start out. They probably won't be of the greatest quality, but they will let you know if you are ready to invest in some production-level sound libraries.