what dealer did your walkthrough/PDI?
that's a basic thing for them to explain to new owners. if they didn't go over that with you, who knows what else they didn't tell you!
yes, the furnace is propane-only. the fan and lighting the pilot requires 12v power from the battery.
before you run anything on the propane, light the stove and let the burners burn all the air out of lines.
then you'll have no problems with the furnace, oven, water heater or fridge running on the propane.
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC