I have a Harman Mark 2.
I get a wood fire going, and split up some hardwood nice and fine. and keep adding hardwood till I get three or four inches of wood embers.
I then open the ash pan door and add about ten pounds of coal evenly across the the bed of wood embers, and let that catch fire.
DO NOT LEAVE THE STOVE UNATTENDED WHILE YOU HAVE THE ASH DOOR OPEN
You will hear a lot of crackling and popping as the coal heats up, then you should see red blue flames as the combo of wood and coal burns. Once the coal stops popping, I add another ten pounds or so of coal and let it catch fire. When this second charge of coal is burning well, I load another twenty pounds of coal, and shut the ash pan door and dial my draft to one turn open.
During this process, I try to keep the flue temperatures below 500F. I have a barometric damper installed 24 inches above the stove, and monitor the temperature half way between it and the stove.
I use chestnut or pea sized coal in this method, either size works well for me, with slight variances in how and when I load the each layer.