I would have to back up with the 2e Worldbuilders Guidebook.
Also loved the series of Dungeoncraft by Ray Winniger...though this concentrated on local area > out.
I have developed my own docs on 'Realm' design based upon those sources above. It includes a template and then seperate docs on how to fill in each part.
I too am a teacher and showed this to another and he said that I could use these in school...so maybe it would be of some help.
(Oh and BTW - the charts are general enough that, by realm, I mean anything from empire to village, to forest, and I have even used them for groups such as organisations or tribes).
The original docs (for 3e, that sev people here got copies of) were more of a 'Realm System', in that every 'turn' you rolled for realm actions and happenings and there were very basic resolution systems. Now I just roll the events/etc and se them for background. (I don't play out the realm's turns).
C