Help with wireless…

My boss recently asked me to find some info on setting up and implementing a Wireless network overlaying our existing network. We are moving to a new office soon and the company would wireless as an option.
I’m really not sure on where to start, I’ve done some research on different wireless protocols(802.11 A,B,G) and have found some good sites about security. But still I’m looking for either some info on the process or what is involved and what to look out for(longterm).
thanks