You have plenty of help available to you. There are two Linux commands that help you find the information you are looking for.
www.rage3d.com/content/articles/atilinuxhowto/(installing ati radeon drivers on linux)www.stanford.edu/~fenn/linux/radeon.shtml(installing drivers for ati radeon on linux for 86_64 processors)www.ibiblio.org/pub/Linux/docs/HOWTO/(list of documents with just about everything you would need to know about linux)www.tldp.org(website for the linux documentation project)
