Attached is a simplified version of the kingdom building rules from Paizo’s Ultimate Campaign sourcebook for use with the Pathfinder Beginner Box rules. I haven’t had a chance to play test this yet, so please let me know if you run into any significant issues. You’ll need some hex paper for mapping out your kingdom and recording the location of improvements and such.
I’m working on a simplified version of the mass combat rules, as well. PFBB WAR! should be forthcoming in a week or two.