If some of William Faulkner's novels are related with characters etc.., in which order should one read them?

Answer 1

Read his trilogy, Snopes, in order this way: The Hamlet, The Town, The Mansion
As far as the others are concerned, it doesn't really matter--Faulkner didn't write in a linear chronological manner, so one book doesn't really follow another. It's almost inevitable that you will need to go back and re-read something no matter where you start.