Systems like http://www.geeks.com/details.asp?invtid=RAPID-OS-EYE-N&cat=VID

As to networking, that's nothing unlike what you use for your internet connection so you get a router from best buy or such and you are done.

The configuration and setup costs about 1,000 bucks if you don't do it yourself. Same for wiring. There are some Wifi cameras but I've yet to find them to be reliable enough.

Best of luck.