What were the key ideas of The Prince, and how did these ideas influence European rulers?

The Prince influenced European rulers because it offered them advice on not only acquiring political power, but how to maintain that power as well.

where is the map so i can

an informal structure in a bureaucracy would be something like so-called "office politics". where there's a formal structure set up for the organization, but then an informal subculture as well that has a way of organizing the bureaucracy further. this can be positive because it sets up an added degree of organization, albeit informal, within the bureaucracy.