how to hook up cable box, projector, ps2 and dvd home theater system?

We have a epson projector it only has the yellow video plug in the back. I’m not even sure where to begin. my bf started on it but he can either only get the dvd home theater and the projector to work, or the cable and projector but he cant get them all together. if any one needs additional info to answer this just ask because i have no idea what we are doing or what cords we have

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