With the make and model of your furnace, you may be able to download a manual with some troubleshooting info.

If you have a BBQ, you might be able to heat up some bricks hot enough (OUTDOORS) to put into a metal bucket to heat a small room in your house. Set the bucket on some bricks. Have some kind of tongs or shovel to move them from the stove to the bucket. If your BBQ has a cover, use it.

Make sure you have a regular non-electronic telephone with a cord (cheap at thrift shops). If you do need to go somewhere if the power is out, it's best to call around first, to find out of friends are home (and have power or heat) or if there are shelters available.

Pull the mattresses off the beds and put them in a corner of one room, building a small shelter with them as the building blocks. Have a blanket hanging over the opening.

Stove dealers often take decent stoves in trade, and sell them as used. Check around. Not only will you need stove pipe, but you'll probably need some kind of brick foundation and surround for it.

Sue