If you look on the stickers, it says "direct spark ignition" meaning there is no pilot light.
I don't see a gas valve , but there might be one further back the on the propane line"copper"
If you have power, propane, and a thermostat, simply engage the thermostat to demand heat,
it should engage the blower fan to purge for 15-25 seconds, then the furnace should light.
Also, if you read the sticker carefully, it seems to give the lighting procedure, but the pic is too blurry to make out the smaller print