I to am aging (63) , this is a hobby . I drag a photo into my dock to open PS . When it opens an image appears , layers box has one layer (background). Out of curiosity I used my pencil to trace the image in black (it works) . Later on the photo will become a line drawing that will be printed off , enlarged with a projector then airbrushed into a finished painting . I have been at Ps for four years now and still confused . Thanks