Wow, a lot more responses and info than I expected
I had heard of Ubuntu being relatively easy to learn and work with, but I'd never heard of Mint, and it seems to have some advantages over Ubuntu for my old machine. I did a RAM upgrade on it a few years ago but was advised that I shouldn't max it out because it might make it unstable. It's going to be a learning tool so the slowest component is probably going to be me for quite a long time. Now that I know where to look and what to look for I should be able to find whatever I need from here on my own, but if I get stuck I now know where to ask for advice!
Many Thanks to All