I am having a hard time finding documentation on the values in the META.yml file. I found documentation for META.json easily enough. I am specifically looking for the yml settings for the resources I have in the json file.
It rather sounds from this like you are writing these files yourself. That's almost never a good idea. Your build system should do that for you based upon the contents of Makefile.PL. Get Makefile.PL right and all the META files will follow without you having to lift a finger.
Also, what files in the repo should I add to .gitignore?
None. .gitignore is for specifying files to keep out of the repo. Here's a fairly standard one of mine - you will notice that the META files are listed here because I want to make sure that such transient files are not accidentally committed (hopefully this emphasises the point above).