I don't know how helpful this will be, as DH did most of the research on these when we bought ours, but it depends on several factors. There are wired cameras that have a wire that runs directly between the camera and the monitor that it attaches to inside the house. If the camera is to be placed outside, this will require drilling a small hole to the outside for the connection. We bought one like this at Home Depot, it included everything we needed to hook up, and it cost around $100-$150 I believe. There are also wireless cameras that can be mounted outside and don't require drilling holes. I "think" they have a receiver that can be hooked up to a tv for watching what's going on. Only problem with these is that generally they use the 2.4 GGHZ frequency, which is what a lot of cordless phones now use. If you have a 2.4 gig phone, then the camera won't work well with this. You also can choose between black and white or color cameras, color being more expensive of course. Some have like a night vision capability so they can work even if its dark out, again more expensive. I just checked the home depot website, and don't see the model we bought, maybe it was discontinued as we bought it almost a year ago. DH did a lot of the research on the internet before we bought ours, so that might be the best way to get better info. HTH.
Cheryl-If I was organized, I'd be dangerous.