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Need Help With Radiant Floor Heating-How to operate my system

I just purchased a home with radiant floor heating and have no clue about how to operate it. The previous owner who did not live in the house bought it at an auction and said that there may be a leak in the system. I asked for any details and he refused to go into any detail.

It seems there are 3 zones and is powered by a small tankless water heater. I can see that a relay has been pulled from the system and that the plug for the water heater is unplugged. I have pictures of the setup and I will post them if allowed. My question is how do I turn it on to test it? How can I tell if water is in the system? If someone here could look at the pictures and be able to tell from them how to operate and test the system that would really be great. I live in a remote area of Montana getting a plumber here is all but impossible and if so very expensive.

Radiant Floor system