In my rv cabin I will have a small 4.6cubit foot refrigerator, a 5.0 small freezer, a small 2.5 gallon hot water heater, a small 5000btu a/c and 2 shop lights, I will have a 50amp hook-up, which breakers would I need to handle these things with a 50amp hook-up?

If wiring is existing, you will need to verify it can handle the loads, #12 is preferable over #14, as it can handle 20 amps instead of 15 amps. I would have water heater, freezer, and frige on separate breakers, the shop lights and a couple of recepticles on another breaker(all single pole). Is the AC 120 or 240 volts? If 240, you will need doublepole breaker for that. Plug will determine breaker.
If you have a space left over in panel, separate recepticles from lights.