Food for thought: More practice matches
"Yes get lessons, yes do drills, yes do some match play in front of a coach, but supplement it with more match play (anywhere.... against anyone...NOT in front of a coach)."
I couldn't agree more, and especially NOT in front of a coach or parent. Kids need room for trial and error but the conditions need to be match-like hence why practice matches/sets are very important. This is really critical for kids in cold weather states and in those states other than CA, FL, TX, etc. where the pool of players is small and competition overall lacks and so leveraging the adults for practice matches is key (i.e., it takes tremendous footwork to play against a good adult hacker . . . it's quite valuable).