One of the most basic specifications of CCTV systems is the format of the camera and lenses. 1/4" and 1/3" cameras are by far the most popular for security work – and they should do the job for you, too. Make sure the lenses you get match the format of the camera.
Another important spec is resolution. Ask for measurements of horizontal TV lines, or TVL. 300 is low-end, 400 is good for security work, 500 is very high quality. If you're going to want to see detail, upgrading to a higher resolution is a good choice.
Do make sure that all of your equipment can handle the resolution your cameras put out, though: it's no good having a 500 TVL camera if your monitor only displays 400.
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