Now, I know I sound really thick, but I need some log burner advice. We hav been in our house for about 12yrs. The previous ppl put in a log burner which I believe was never used. We've never used it, but I wd like to have a go. But, I have no clue how to. Does the pipe that goes from the back go all the way up the chimney? Would I need to get the chimney cleaned first?