Some general questions from a novice ZX programmer

[britlion]

I solved most of that stuff already, thanks!

Well done!

Have a look at the tutorials: https://zxbasic.readthedocs.io/en/docs/tutorials/

And for the pac man clone, you can grab a copy of berksman and work through the code that it ended up being, as well as read the blog I wrote about it - quite a lot about things like UDG sets. You'd use character sets the same way. (Or possibly, use putchars to dump it to the screen directly from the font data?)