To do this right, as you have asked it, requires a lot of maturity in the
muscle structure and mental discipline of a pitcher. There are no shortcuts, quick fixes or examples to follow like doing things exactly like a player that he/she admires in the Majors. This much I know.
This is the case regardless if the pitcher is a mature twenty one year old or a ten year old. Unfortunately, for the ten years old, things get a little dicey. Practice sessions have to address a lot of things that are not under his/her control, like the opportunity to practice frequently, decent fields to play and practice on, and his/her experience with the growing process.
Although I do not coach or involve myself in the amateur youth game, I have witnessed success with a method that allows a youngster to simply enjoy the game, a Sunday ritual of playing catch with dad, summer lawn chairs watching high school or other games, and stuff like that. When the time is right, about thirteen or fourteen, all this will come together for the youngster and they seem to be more receptive to a little more “do this- do that”. There must be exceptions, to be sure.
I’m sure others can give you a much better direction, specifically to your question. My contribution here was based on observing youth coaches.