Very handsome and lovely stove.
Yes I see what you mean. The directions are for wood.
There is reference to both primary and secondary air controls and how you use for wood. the opposite will be true for coal. Coal needs air from under the grate for the most part.The exceptions are when first firing or when re-loading coal it will give off gas that needs some secondary air to burn and avoid puff backs which can happen if unburnt until enough accumulates and then burns all at once (explodes). Once initial gasses are burnt off then just a tiny amount of secondary air is good to burn off any carbon monoxide formed.
Read the thread "Basics of a hand fired stove" to get started.
Basically you will start a wood fire and when that is well established you gradually add layers of coal until at least a minimum of 6 inches for pea coal and about 8 inches for chestnut or nut. it can be sloped higher toward back if necessary. Assuming anthracite coal. Don't use anything else. Do get a carbon monoxide detector.
For clearing ash go to hardware store and buy a 1/8 inch thick by 3/4 inch wide piece of steel at least 30 inches long. Once deciding on a comfortable length you can bend over an additional 8 inches on itself for a handle or add two slabs of wood instead. To bend heat the area to be bent red hot and bend over a piece of pipe with a hammer.
You will have to slide it under that fuel bar to do its work and reach all the way to the back of the fire box, so the fuel bar has to have a gap under it to use the poker or slicer. It can work very well and much better than the usual inadequate shakers on European stove when provided.
Be prepared for at least 5 times the ash of wood and never ever let ash build up in the ash pan to grate level because that will destroy the grate.
Good luck and keep us posted.