I’m sure there are some tutorials on youtube covering the drawing setup process but I don’t know of any particular one off the top of my head at the moment.
I think the best/easiest way to show it, is if I work directly from your file and kick out some screenshots and a Fusion file. Do you mind if I do that?
Otherwise I did write a brief run-through a little ways back. It’s buried in a Parametric Box thread I shared here but here’s a link to the jump if you want to see it: Parametric Box with Finger Joints - Fusion 360 file