Good evening, mikeadamski26!
I haven't played these games and probably wouldn't know much about the style of game that you'd be looking to create, but I'd like to add my 2 cents.
I believe you will have to understand the base knowledge of the data files such as JSON, arrays, and stuff.
Assuming that you've taken a look at the built-in game examples, you'll eventually find some other material on the site's tutorials
If you're willing to spend some money, the Data+ plugin from OverBoy would be an easy help.
And to make my 2 cents at least 3 cents, you may find some decent graphic assets at the Kenney site, they're free.
With luck, you can also pick some themed royalty-free pictures from sites such as Pixabay or Pexels.
I know it is not much but I hope it helped. Stay safe;