Introduction to Ken Kesey's 'One Flew Over the Cuckoo's Nest'

It's taken me quite a bit to decide on a classic book, but I've decided to take my time to read One Flew Over the Cuckoo's Nest by Ken Kesey. I read the sample, and frankly, I have no idea what's going on. From what I comprehend there's a mental ward, a group of black boys who do this person called the Big Nurse's bidding in the mental ward, and some weird stuff happens from the Big Nurse growing really big and beating up the black boys (don't get me wrong, they're really called this in the book) and some very exaggeratedly cruel punishments (That I have now confirmed are hallucinations by the narrator) done to the misbehaving patients in this hospital. We're introduced to this man called McMurphy, and from the description of the story in amazon, he'll turn the hospital upside down. I recognize that I have an unreliable narrator, and that may not be the best thing for me, but I can handle it. Though the book does not offer as much dialogue as I would prefer, I hope it can prove me wrong on my opinion on the fact these types of books (typically older, classics) lack the key to make me emotionally connected to characters in any way, due to their lack of dialogue and over-explanations.