Good to see you! Have we met before?
Ah, yes, of course—here is the first clue to filling the map—rows 16 and 17 are as follows:
Now, every clue you find hereafter will indicate the relevant row(s) of the map, and exactly how to shade it.
But the clues won't always take the form of images.
Also, 1 is black.
Now go to the root to proceed onward.