Typically, I start with tetra-chord form scales (LH 5432 RH 2345) and move to note reading fairly quickly.
But, I currently have a student who is five years old and is having some trouble grasping the concept. He can play tetrachord scales now - C and G - but when I tried to teach him about the note reading - it was too hard of a concept for him yet.
Here's my creative idea - but if you have any more - please share! OK. I took an 8 1/2x11 sheet of cardstock and folded it lengthwise by 1/3 (about the length of the black keys - which it is supposed to make. Then, I cut into this folded part eight equal 'keys.' Then, folded back the alternate ones to make a set of two black notes and three black notes.
Take a look at this:https://www.soundfeelings.com/products/music_instruction/music_reading_tool.htm
I think, this is even more confusing. The black keys are not part of the 5 line staff, they are notated with accidentals (!). So just laying the keyboard layout over the notation staff is not very helpful.