Correct way to make this wired setup wireless.

http://www.cityinfrastructure.com/Data/PhysicalDiagram.png

I'm basically just trying to make it possible so that the Office and Warehouse both have wireless capabilities and can still be connected to the same server regardless of being wired or wireless. I'm sure this is a very easy question, and I'm at the beginning stages of my IT education so I feel I'm over analyzing this. Am I able to connect a wireless router into the switch at the warehouse or would that not work? If that works then would I be able to connect a wireless router from the main switch to the Office? I feel like that's too easy. The goal here isn't to completely revamp the current set up, but just to make the office and warehouse wireless. Thanks for the help in advance and sorry if this is such a basic question.