I agree a wealth of information is available from knowledgeable members on this site, definitely take up their offers of help. It was invaluable when I added a 3 spool valve to my tractor.Is there a good textbook or go to web site to learn about tractor hydraulics?
Returning to your original question, I also found this https://www.munciepower.com/cms/files/Products/Literature/Documents/Training/TR-G93-01.pdf very handy for understanding the broader picture. While it's for Muncie truck mounted systems a lot of the information is transferable, its from a very reputable company and its quite concise.