Not sure why you would need a cookbook either... I just peruse online recipes and there's a whole bunch of stuff on the Instant Pot facebook page. TBH I use mine mostly for stew and chili
I have the 8qt as well
When I make beef stew in it here's a tip.
Do not cut up the potatoes more than half,, do not quarter them or you'll get mush. And put them in last on top of everything, not in the liquid. Max time under pressure 25 minutes,, and a quick release. otherwise everything gets mushy. When it's done and you remove the lid you can stir and sort of cut the potatoes into smaller pieces at the same time .