Building a Monitor
The way that I made my monitor was with an old vhs video camera and a t.v.
It's pretty simple, just take an audio-visual cable (the one with the red, white, & yellow ends) and plug them into the correct audio-visual holes in your t.v. Then plug the other ends of the cable(s) into the video camera. Now, turn on the t.v. and the video camera.
Depending on what t.v. you have,
you might have to put it on video1 or video2.