Neil has a ton of family photographs that he'd like to digitize and share with the family, but he's not very computer literate. That's why Leo says to get a service to do it for him. Or he could get a computer and a negative and slide scanner. The Epson V600 Photo Scanner can do it, and it's $229. He'll want one that does 600 DPI or better and does negatives, slides, and prints. The modern Epson scanners will scan to the cloud and he could store them directly to Flickr or Microsoft's One Drive. That way they're in the cloud where family and friends can download them. But by the time he pays for all that, and factors in his time, he may as well have a service like Scan Cafe do it. They will also clean the negatives, color correct them, and scan them to him on CD. It's a great way to do it.
Chris Marquardt says that with that many slides and negatives, he'd have someone else do it because of error clean up and scratch removal. 5-10 minutes for one single image would just take too long. So he uses a service to do that work. It's worth the time and money. What does he scan at? Chris uses 1500-2000 for slides and negatives. 600-1200 for prints. But most values for scanning don't really do that and doing too much DPI just blows it up more than actually getting better resolution.
Chris says another option is to get a light table and then shoot it with a DSLR and a Macro lens. Then he'd get a 21mp image of his negative/slide.