To scan negs and transparencies, you need a scanner that's designed for the job -- sorry! If you use one of those triangular reflecting adapters, you won't get very good results. You can get flatbed scanners with a conventional under-bed lamp for ordinary scans, and a lamp in the lid for negs (+ a film-holder); or you can get a dedicated film/slide only scanner; or you can try High St photo processors to see what they charge to do your scanning for you.

You want to end up with 48 bit colour (16 bit B&W) and a very high resolution, and have the files in a non-lossy format. JPEG, for instance, gives you compressed (smaller) file sizes, but with the loss of some information; TIFF files can be compressed without losing anything. It will take a lot of CD space (and remember CDs may be obsolete in a few years!) and a long time.

Steve