There are 3 types of output from the DVR which is BNC (Coaxial output which could be connected to the Yellow RCA input of TV), VGA and HDMI.

The older generation of DVR would only provide BNC and VGA but the newer generation of DVR would come with VGA and HDMI. It really depends on the CCTV DVR that you are purchasing.

if you plan to have the monitor turn on 24/7 viewing the CCTV, then it would be advisable to use LCD rather than Plasma image retention issue of the Plasma.

Any TV or LCD monitor could be use for CCTV application for home or office.

if he has pulled a black wire without any termination, this means that he has pulled a Coaxial cable. You would need to purchase a TV instead of computer monitor as you would need the yellow RCA input in order to view the CCTV.

you dont need to connect the DVR's video output to you PC.

ALL DVR in the market r able to do remote viewing either by Internet Explorer or by dedicated Centralized Management Software. you only need to connect the DVR to your network and you would be able to view it through any computer or mobile phone. All installer are able to do this setting for you.

if you are within your own network, you only need to key in the DVR's IP address into your web browser and you would able to view, playback and even do minor setting of the DVR including backup of video.