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.
what should i do? what are the things that i need? what type of cameras? what type of routers? etc..?
i dont really like them to be clearly visible because they are for security purposes... any help would be appreciated...