Welcome to the world of old and slow
#1 There should be an AC power cord accessible from the out side. It should have a 110 plug, it may have a 30 amp plug and an adapter to a house hold outlet. Plug it into power and then find the switch on the refer that says AC/Gas switch to AC and wait 3-4 hours and then see if anything inside the refer is getting cold.. VERY IMPORTANT, the refer must be level.
#2An RV store should have a leak check fluid. OR just mix up soapy water and dribble on each joint you can find. Light the stove first, then water heater and then the refer. Make sure there is water in the heater before you light it.