Hello, a very long time ago I made YouTube videos (they're all delisted now) and I thoroughly enjoyed it! I suggest you do too.
I'm a Mac user but a bit of research showed me that VLC allows you to record your screen. VLC is free and I doubt it will have a big watermark like Bandicam does.
As for what you could make your videos of, well you could have a towny series following your journey from when you first join a town.
https://youtu.be/w7KW3PtUWJc