Here is a Google search of info for you to get you started. I have never tried disk imaging before so I don't know the particulars.
Basically, you do your fresh install and when you get it to a point that you are happy with, all set up with your apps you want installed, etc, you make a disk image. Any problems, you restore to your boot drive/partition from that image.
I have heard Norton Ghost is a good program. It will image the Registry, which some other software do not. There are free alternatives to Ghost out there.
Have fun!!