ConataeGaia/Sample
Sample is a world of the collaborative campaign setting ConataeGaia, by Wordman. Some mention of the level of detail you are shooting for here would be useful. Some authors may just want to do a high level outline sort of approach. Others may want a multiple page detail fest.
This would be some introductory text about the world. The point here is to give people some idea of what the world is and why they would want to use it. It's kind of the teaser trailer.
Contents
Broad Strokes
This chapter would present the basic notion of the world, how it is different from Creation, and answers to some of the questions on the main setting page. This is the place to nail down your basic concepts, probably with their own subection headings and so on.
History
The history of the world.
Pantheon
A description of Gods created to run the world, or whatever alternative Gaia might have employed on this world.
Almanac
A chapter about the details of the world itself.
Regions
The broad geography.
Movers & Shakers
The people, nations, whatever that shape the world.
Inhabitants
Races, ethnicities, species, etc. that are important to your story.
Player Characters
What PCs do in this world, additional mechanics and so on, if any.
Stories
Plots that might occur here. If the world has a major storyline, this is the place.
Using [World]
Advice to Storytellers on how to use your world.