I didn't even had X-Plane 12 yet myself, but I just bought the upgrade, because one day. It will come back to me. And it has come back to me. I agree it's a lot of money, I can financially help you a bit if you really want it, unless you already bought it?
These are the PDFs that are included with the airplane in the Documentation folder. Reposting them here for users who have not yet bought the model, or who wish to read them on another device.
QuickStartGuide.pdf UIGuide.pdf DataRefs+Commands.txt NormalChecklist01.pdf NormalChecklist02.pdf