You didn't find an all encompassing guide because there isn't one.
If all you really want are some A-10 pages, many already exist.
https://www.digitalcombatsimulator.com/en/files/2875049/
for example.
Google will find you many, many more.
If you want to learn how it works search, and read through the kneeboard threads.
While the basics are simple, it's far too complex for anyone to explain it all in a quick little post.