Set up a Network in different states

[Atta_Girl]

Hi Everyone~ As you can see I am new to this site, but also to the IT Field- so forgive me if I'm posting in the wrong section, or if I don't sound right in what I am asking.

For my Concepts class, the question is if I were to implement a network for a company in 5 different states, how would I go about doing it?

This is my personal thoughts on it, so please add FB if you can w/ main components I am lacking, etc. or if I have it completely wrong.

My answer to this is

first I would have to make sure the company in all 5 states had a group of network admin

Each state branch would need their own router

Every computer in the whole company which will be connected to the network will need a Network Interface card

Each branch would then connect to a LAN, which connects to a WAN which makes the networking a go.

Now I know most networks need a file server, so would this be 1 for the whole company (which I think) or 1 per branch ie. in each state?

Lastly, am I on the right track for networking?

Thank you all!!!
Atta