If you have a fast network connection, recommend you
go to
http://sunsite.unc.edu/pub/Linux/ . Look in
the 'distributions' directory and pick one. Slackware
is easy to download using the WGET utility.
If you don't have a fast network connection or not
experienced in downloading large distributions, the
recommend you click on the RedHat 6.2 book on the
https://www.unix.com homepage and purchase book, CDROMs, etc
to install. The small price for the OS with documentation
and CDROM are well work the money.
We tend to do both. But when we need an new OS fast,
using WGET and sunsite work... but we have 764kbps
SDSL internet access.