Another quick and simple way to set-up your initial stages of security is to use internet cameras (look here at TigerDirect).  These can be wired directly to your ethernet router , or hooked up to work wirelessly.  You can also purchase spy type cameras, which conseal their appearance. And you can also use wireless routing to set-up your home network.

There is usually software which comes with these camereas, so you can have multiple cameras set-up throughout your house or business.  This software can record video.  Some have built in motion detection, which can triger various functions, including sending you an alert e-mail, or triger the video to start recording.

Utilization of DynDNS services will allow you to tie in via the internet.  This will allow you to type in a specific url, which gives you video access.