Just read mcleodnine's reply. He's got some good input and may understand your question better than I do.
I would still suggest that you purchase, rather than download. Go here and do a search on "redhat linux"
Also, get yourself some good documentation. If you want a good source, get "Red Hat 7 Unleashed"
, by Bill Ball, David Pitts, et al. ISDN# 0-672-31985-3. This book sells for around $50 together with the RedHat CDs. Also, no offense, one of the Linux for Dummies
books can't hurt. We newbies need all the help we can get.