Here is a video of someone playing on it for the first time: SCENARIO EDITOR : Kingdom Management - Age of Empires III : Map editor
I tried to create a feudalism like economy.
Basically you have a tax collector who goes from villages to villages to ask for taxes. Some villages are hunters (they produce a lot of food) some are miners (gold) some are mixed between farms and wood etc.
When your tax collector ask for payment, they will give what they have gathered. This way you can train armies and fight the opponents (japanese pirats arriving by sea). But be careful as if you tax a village too much so they don’t have enough resources for them, they will revolt.
When a village revolts, you have to fight both them and the pirats, and they obviously won’t pay tax anymore. They will stop revolting once they get more resources, or if you destroy the village (all that while fighting the pirats). If you destroy one village, the others will stop revolting against you because of fear, but you will have to handle their economy yourself with one less village.
Eventually, the emperor army arrives and help you push back the pirats.