I am very heavy handed, and I usually ink/outline my comic draws with a 2B Mars lumograph pencil . I generally use a 2B pencil to sketch. I recently switched to a HB pencil to draw a little lighter so mistakes are easier to erase. Until your course, I never thought about tones and shading.
To make differentiations in tone, I had to outline the cast figure with a 2H and then shade with an HB and 2B pencil.
I used a grid to do this drawing.
Have a great week.