This has been asked many times and the general consensus is that there is no obvious way. You could offer to scan photos from original copies, onto CD and this could bring in pin money but I'm afraid that is it. There is Ebay but there are very, very few people making any proper money off it and even the ones that say they are seem a bit dubious. If one could make decent money using a computer we would be all at it. If you want to make beer money then it is possible but any decent income forget it.