That should be enough to get you started. Some general info you don't have to roll for because it is fairly commonly known (Some of this was addressed in the recruitment thread but I know not everyone will remember:)
Three of the tribes located around Mt.K became the most actively opposed to the corps following the spirit incident. Of the three, the Maasai are thought by many to be the most violent of the three groups (or at least they seem (Some of the targets they are blamed for may be less directly linked to corporate interests or something befalls a more remote group and allows for stories, accurate or not, to spread (less tangible evidence to say what exactly happened - and it very well may be as severe as the stories make it out to be, or worse. You can't say for sure)). Being more remote (seperated from the cities by more distance) so how accurate this assesment is, is a matter that may be open to some debate.
You are going to have to find someone with a lot more information though if you want to know exactly where their lands begin, or how they protect them, as the area in question doesn't get a whole lot of travel these days, other than by those who live in the area.