Network Design

I have been give by my company to design a network. I have been a sample to design and then will decide whether I am qualified for this new position in the organization. I am looking for some information like
How to connect two buildings one of them has main server and other building is involved in developing software.
How the data should be send from this building to other building.
Can u send the information how to design or the website where u can find the informatin on how to design thenetwork