Advice on show bibles.

I am working on an idea for a show, I've written many features before but never played with series or shows, this is a first timer, any tips on developing a script bible. I've been told what's needed to pitch one is the Pilot itself and a bible, which apparently is a resume of all aspects of the show, characters, tone, plot and the likeness.

I am looking for any useful advice here, and if possible, maybe a bible to take a look at.