Network security and WAN

The project is to design a network, network security and WAN connectivity for the following situation:

Organization of 100 computer users in three locations.
Location one: two buildings, 25 computer users in each building.
Location two: one building, 15 computer users.
Location three: one building 35 computer users.
Document your design as follows:
Introduction to the design Explanation of equipment and software used.
Diagram of the entire network.
Diagrams for each location.
Explanation of security procedures.
Explanation of WAN connection.