Is there a best place to start learning this method? I need the version for 3rd graders...
NO, there is not , or maybe there is. ok cynical mode off
I think Mo already gave you some answers in his thread:
https://www.kreslik.com/forums/therumpl ... e-by-t3256
further i would say : read and reread... there is a lot of wisdom written over the years in several threads
by a lot of wise people. mo tro es/pip bredin dragon33 to name a few and a lot of others.
start practicing, maybe make an own thread, drop in a picture with what you see and i am sure someone jumps in and gives advice.
further at the beginning of this thread tyger dropped a lot of usefull links.