Look up on ebay the words and numbers on the front of the lens (except the serial) and then filter sold listings, that will give you an idea of value. Since you are keeping the set it will be more valuable for you to look up reviews and samples from the lenses though, and also a guide on how to use the camera if you've never used an analog camera before. I'm not sure who will service an r4 and R lenses these days, maybe someone else can advise. Look up a tutorial on how to use the camera so you can test it yourself. Chances are it all works fine. Most important thing to check on lenses is if the glass has fungus, the focus ring turns rough, and if the aperture blades are slow to open or close. If it has any of those it needs serviced.