OP, I am in the same situation as you. Brand new stove brand new piping brand new everything. The first few fires that I had in it the last week or so I’m struggling to get enough heat generated to create a draft so the smoke leaves the firebox. The issue is like the comment said is with a cold flu you’re not getting enough draft to push the smoke up. I noticed with mine that if I start with a lot more newspaper to get a good flame started, this gets the flu nice and warm so the smoke drafts out. I do like the comment and idea about leaving the door open and getting the inside of the box up to room temperature.