Thank you all so much. That seems like such a simple way to organise them. I don't know why I didn't think of that myself. Previously I've done folders for events which was ok but then random family photos, mainly the kids, I had started folders for each one but now there are so many kids in the family it was getting a bit frustrating so I've just been dumping them in a "to sort" folder.
Am going to look into the tagging also so hopefully it'll be easy to find photos of a certain person or event etc.
I haven't printed any photos in ages, well probably ever other than wedding photos. But I just bought a bigger usb so I can finally start using my digital photo frame so need to sort them first.