Well thats very much off-topic and particularly realted to a local market. On this topic, you can email me if you need further help.

There are two ways.
1) Select camera and then a compatible display unit.
2) Find a display unit and then choose a compatible camera.
3) You can find cameras and monitors at various shops who provide security systems for offices/homes.

I am sure composite video output cameras are readily available at Hall Road Lahore and so are the monitors.