Yeah, I finally figured it out when I actually, um, paid attention to the stuff the game was trying to tell me :).
But wow, there is so much stuff here. Main quest, side quests, mercenaries, cultists, war…sheesh. Though I will say I am constantly, and chronically, running out of resources, so I spend a lot of time harvesting. And apparently, in Greece, olive trees and clumps of iron grow together, who knew?