Links to the Battlestar Galactica 'bible'- an excellent example of series description. Doesn't have to be this detailed for most 'bibles' t.
Next, we expand this link with a detailed look at Ron Moore's bible itself. Very interesting to read the source bible itself first, and then check out what's in this link.
Link to a mid-series episode. Notice the opening summary.
The Unofficial "Seeing Things" website
An overview from Tvarchive.ca
Freaks & Geeks
This will give you an idea of the structure of the pilot scvript for the series "Freaks and Geeks"
Here's a pdf of the pilot script.
Clik -for Pilot.pdf