For a black tank, connections should be very simple: The toilet drains directly into it from the top, and the dump valve dumps from the bottom. If you have the original dump valve on there, then it will very likely need to be replaced. Similar if you have the original toilet. If you remove the toilet, inspect the flange where it mounts carefully. This is a common place for the tanks to crack with age. Similar with the flange where the dump valve attaches. IF your dump valve is functional (ie., it dumps and it doesn't leak), you can run a garden hose in from the top and fill up the tank with fresh water, then watch for drips/leaks from the outside and underneath. That is about all you need to do to inspect/test your tank.
good luck!
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