Go and get a user friendly distro of Linux, such as Mandrake or SuSE. If you are starting out, it is probably better to go to the store and buy a copy of the distro instead of downloading it. The documentation that you will get from buying it is well worth the money alone, not to mention that you are getting a superior operating system.
YOu probably won't need to use fdisk at all. If you are running $hitblows 3.x, you can resize your FAT partition using YaST or Diskdrake during the initial installation. With SuSE, you even have the option of creating a boot manager and saving it to a floppy disk. If you get sick of Linux, you can then just go into fdisk, delete the "non-DOS" partition, and not have to worry about removing Grub, linload, or LILO, from your MBR. SuSE 8.0 comes with Wine (windows emulator) so even if you have Linux running most of the time, you can still point Wine to your C:\Windows directory and run most of your apps.
Logitech USB mouse?? I have one running on SuSE and it works just fine. My Iomega zip disk had no problems either. The only thing I am having a problem with is my printer.
Give it a shot. It is worth the $80, and even if it fails you, at least you can say that you tried it. Microsoft makes 90% of their money off of people that are unwilling to try, and unwilling to learn. By giving it a shot, you partially remove yourself from that categorey of people....and that is kind of fufilling in a small way.