Trollsmyth's Quick and Dirty Setting Info for Players Checklist

 

0 - Really rough overview in one sentence (plus picture if possible) to give players the general idea.

1 - Name and basic form of government.

2 - breakdown of population by race.

3 - clothing and overview of culture (whenever possible, use pictures for this).

4 - a random life-path tables that players can roll on for what sort of situation they grew up in, possibly followed by early adulthood.

5 - gods worshipped there (just a name and basic description; if they want to know more because they want to play a cleric, have that somewhere else.)

6 - how magic is learned (school, apprenticeships, hedge-witches, etc.).

7 - list of towns and cities the PCs could be from, with a single sentence description (though might be best to wrap this into #4 above.)

8 - description of how names are constructed, plus a list of names to pick from.

You have, at most, 100 words for each section (not counting tables and name lists) and 50 words is much better ("brevity is the soul of wit" and all that), so you want to use random tables and pictures wherever possible.