"You can never go wrong with a Neil Gaiman book"
^^ This.
I started with
The Graveyard Book, which I loved, and next read
American Gods, after which I immediately subscribed to Starz for the sole purpose of watching the first season of
American Gods, the TV show, which was brilliantly creative. (I then canceled my Starz subscription, planning to resubscribe for season two--until I read the bad reviews.)
I also recommend Good Omens: The Nice and Accurate Prophesies of Agnes Nutter, Witch, which Gaiman co-wrote with Terry Pratchett. After that, you probably will be as excited as I am about the six-episode series, with Gaiman as writer and show runner, that will be released on Amazon Prime Video in May. Here's the trailer:
http://www.youtube.com/watch?v=2ZSXlNRRoGU