My husband taught me how to build a fire in the woodburner in our new rental house. It worked perfectly the first day. Today it started snowing and temperature really dropped so I decided to build a fire. I opened the flu and vents to allow air in from the room. I warmed the chimney with lit newspaper and then lit the paper on the bottom of the fire box. Then I closed the door. Each time the paper started burning well but the kindling wouldn't catch and then smoke would come out of the top of the glass window on the door. What am I doing wrong?