Connect the pi to your router via ethernet, give the pi a static IP, point your router DNS to the IP of the pi. That's pretty much all you need to do aside from actually setting up pi-hole
I looked into them because I hate cooking, often forget to dedicate time to preparing food and then over eat junk because of convenience, but the cost to get them where I live didn't make sense for me. If I could find something local and cheaper I'd definitely give it a go.
If you have two displays for you PC and are willing to do a bit of fiddling, I think you can set up split screen two player stardew valley which is a great chill game
Did uh... Someone jizz on the sandwich?