You can find many links to different Linux distrubutions by running google searches. Try going to Linux.org first and read about different versions and which on might be right for your needs. After you find one, for example, Fedora Core 1
. This isn't the most fabulous Linux OS around, but it's good for beginners. Just download the images, burn the CDs and install the OS. Make sure that you have made 2 unformatted partitions on your hard drive (if you are going to share an XP drive.) Then the installation will walk you through formatting the partitions, and installing the OS. If you have installed Linux AFTER Windows, then it will formulate a dual boot for you.