It sounds like the prior owner has shut off the valve to the gas line going to the furnace. You need to look on the other side of the wall, where the propane line comes from, to see if there is a valve. Or shut off the tank, loosen the propane fitting to the gas valve a little bit, then put on some soap, open the propane gas valve at the tank, shut it, and see if any bubbles came up (or have someone look for smell of the propane then shut off the tank quickly as you know there is propane to the valve).
Your furnace fan should be coming on when you have a call for heating. If you are getting 12 volts to the furnace motor, then it is bad if it is not blowing out air.
As for the pilot, if there is gas to the valve inlet, then there should be gas going through the valve when you depress the "Pilot" light. You do know to turn the valve from on to "Pilot" then press it in? Gas should flow. Then light the pilot, and hold in the pilot valve for 30 seconds or so. If the pilot lights, yet will go out each time you release the valve, the thermocouple is probably bad. If the pilot will not light, but you have gas to the valve when you loosened the fitting for a few seconds, (and tighten it before turning on the valve again) you have a bigger problem, that someone else might have to solve. If you have no gas to the valve, the prior owner might have put in a valve, to shut off the gas because the heater is bad or for some other reason.
Good Luck,
Fred.
