The first two trainees are really nice (Especially the Superstar) but i would ditch the third trainee and sell/fire him due to his awful outside D and awful passing. Also before i suggest how to train them I would go at and try to find a cheap level 4 trainer so that these trainees can pop faster and have a better chance at reaching their true potential.
As for training them I would train their passing and handling first (up to strong-proficient range) and then move to outside D (or pressure for PG) until both have at least prominent outside D. That would be a nice start. Of course this is just my opinion so i would wait for a few other more experienced managers to comment and give opinions before you lock in on my suggestion. Good luck with them!
E.B.W.
Murray/Harris/MPJ/Grant/Jokic - 2020 NBA Champs