There is a book, but it's very sketchy, scattered, and pretty poor - but with good direction, it's brilliant.
The set could be very complex of next to nothing - it depends on the production. There's usually some sort of platforms/scaffolding involved in the back.
The songs are amazing!
And yes, you should definitely audition for this! I'm working on a production right now in nyc and it's a blast.
"If you are going to do something, do it well. And leave something witchy."
-Charlie Manson