What I'd like to do is remove all but 1 functioning disks and re-install Mac OS X so that I have a functioning Mac. I've been a Windows user my entire life, so I'm unfamiliar with how Mac OS X OS ...

To install macOS Mojave on your Mac, you just download it and let Apple's installer do its job. Only, that installer is big — circa 6GB — so downloading it can take a time.

If you have an OS X installation disc that is not working on your Mac, there are several options you can use to get it up and running again.

First, if you have a bootable Mac OS 9 Software Restore CD, Apple recommends that you erase your hard drive and start with a clean install to perform the multi-disc restore as described in ...

I just found out that my friend has a newer Macbook Pro that came with a disc that is labeled "Mac OS version 10.5.2" Is this disc compatible with the old Powerbook?

Another option would be to boot your system up from your Mac OS X install DVD and run Disk Utility from the disc to restore the image to your boot drive.