It's good to get a hold of the Guide to the River Kingdoms. It has all of the in-depth information that's available on the region. The book is out of print, but the PDF is readily available.
You may also consider Ultimate Campaign as it expands upon the downtime/kingdom building/mass combat rules in Kingmaker, but it is not necessary.
I already have the Ultimate Campaign. It is a great book and I really like their expanded kingdom building rules and the larger variety of building options. I look forward to exploring those mechanics.
I took a look at a preview of the Guide to the River Kingdoms, that seems like a book I need to get, thanks for the tip off on that one.
What would be a great book to pickup on Brevoy and the cities and noble houses within?
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If you are looking to expand on the main villain of the campaign and add more flavor about them into the early path (which a lot of people suggest) there is Legacy of the First World (for NPC building options) and The First World, Realm of the Fey to better understand the motivations of the BBEG.
Since you are also fighting a lot of humanoids I tend to suggest The Monster Codex for all of its readily built variations on basic humanoid enemies like ogres and trolls. Of course that isn't strictly required.