locations installation

Hello, We are soon moving to a new building and as the IT manager I have been asked by my employer to determine the correct outdoor security camera set-up. I have tried to be a good student and have read the Wiki and Cliff Notes, as well as spending a fair amount of time reading in this forum...

Looking to start out small and build as I go. First location I want to cover is the front door, then move to the other parts of the house. The issue with the front door is the layout of the entry. I have an 8 foot door and very tall entryway that is entered by a narrow walk between two walls...