im pretty new to the whole mac world and have a secondhand G5 iMac i plan not only to upgrade the hard drive and the os i have learned how to exchange the hard drive and my leopard box set is in the mail when i install the new os on the new hard drive will there be in drives to install like there is when doing this on a pc and if so where is the best place to find them
The Leopard DVD contains all the drivers and the installation routine will install them itself. You don't need to hunt for any drivers or manually install them.
Also have a look at the following links, as the information presented there might be helpful in your future endeavours into Mac OS X and could clear up initial confusion and may even prevent harm to your system or your files.
Mac OS X Basics
Switch 101 - guide with articles made by Apple on how to accustom yourself, after you switched to Mac OS X from Windows