I worked for five years on a virtual spinoff of Buffy the Vampire Slayer
which proved so successful in generated its own fan fiction. Literally, I had a major role in at least a third of the episodes, a minor role in half of the rest, wrote a few dozen eps myself, and took part in planning for each 22-episode season.
Agree with MikeH92467
, a "bible" will help a lot. But the entire staff needs to contribute to it. More, you will need someone to function as Executive Producer, a voice of final authority. And some kind of forum just for the staff.
I'm also very curious about the basic premise. Have sent an email.