Finish an Era with a Village which has at least 150 Food, Wealth and Tech in Use
Ambassadors are your first focus. You need a lot to unlock extra aspects necessary to transmute materials and create superior resource points. A Desert Ambassador for the Rock Giant, a Swamp Ambassador for the Swamp and a Forest Ambassador for both the Forest and Ocean Giants.
With these ambassadors aquired you need to focus in on one town. With a few set up the best course of action is to check their initial projects and base your focus on whichever village is already most rich in resources. So the first course of action, after choosing your village, is to maximize any and all Project specializations. Adhering to these requirements will generate a lot of resources on its own.
After ensuring that the output of your project can be increased no further you must then turn attentions to whichever resources are lacking and fill the holes. Is Food low? Forest Giant plants and Ocean Giant Animals. Wealth? Rock Giant Minerals and Swamp Giant Animals. Need Tech? Swamp Giant Plants and Rock Giant Minerals. If any continue to lag behind then remember to apply your aspects!
This Development really is up to you, and the ease of it hinges predominantly on the projects that appear.