This is where I ask if you have any experience with TV's other than watching them?

If the answer is No, then as a start go here (there's plenty of other places on the net too)...

http://www.epanorama.net/links/videosignal.html

and read up about what makes up a composite video signal, horizontal and vertical syncs, differences between monochome video and colour video, interlacing etc. There's no point in trying to generate a TV signal if you don't know what you're doing to start with.