I've never seen the show before, so it will be based on the book.
Well I have two ideas in mind now. One is to see if I can edit the localization files and rename every tier to the next highest tier. Like Kingdoms now would be called "Empires" and Baronies would be "Counties." This would make up for the lack of detail provided in the books. For Instance, D'Hara does not have many defined places, it is mostly just empty plains, yet it is an empire and not a kingdom. It would be king level but be called an empire.
The second idea is to leave the tiers normal but make up a bunch of fictional cities to make the game more in depth.
Either way, all of the lands in the Midlands, including the Mud People, will be united under the Mother Confessor at the start scenario. I will work on the start first and eventually add to the timeline once the start scenario is finished.
I already have the map split into 35 areas or so that I'm planning on dividing further. Just not sure how fine I'm going to divide them and how much will be fictional.
Main Problem I'm having now, I have only divided the Westland into 2 or 3 areas, with one of the areas being almost uninhabited. I will work this out though.
In not too long I will be able to post how I divided the lands on here.