Seeing that you are not that familiar with Linux, I would really recommend you
NOT installing redhat 9. It's a old release that's not supported anymore, and most likely you will run in to a lot of problems with getting current hardware working.
Instead go get the latest ubuntu (
http://www.ubuntu.com/getubuntu/download) or if you want to stick with the Red hat flavour, Fedora (
http://fedoraproject.org/en/get-fedora) these have better support right now and are much easier to use for a newcomer for Linux.