Age and height are nice. However, both of those guys are marginal talents, at best. You really want to train guys that are 18 and have average-respectable in three or four primary skills at least, and probably want them not to be horrible in their secondaries. I guess the best way to represent this is in outline form
PGPrimary: OD, JS, Pass
Secondary: Handling, Driving, Jump Range
SGPrimary: OD, JS, JR
Secondary: Handling, Driving, Passing
Training inside players is somewhat easier, the solid but unspectacular variety typically only needs Inside Shot/Inside Defense/Rebounding. Other skills are gravy -- it's good if there is some; the only ones you probably need to worry about training are Shot blocking and Jump Shot.
This is about as simple as I could keep it. Make sure you get a decent coach, but don't spend too much resources on it. Level 4 (advanced) is probably enough until you get the hang of it. Half decent trainees (18-19 yrs old with average-respectable primaries) could probably be had for cheap on the transfer list. Make sure the height is right (guards must be short, big men must be tall). Petersen is probably trainable, but Schreiber is definitely a waste of time.
Also, there is a neat little (or not so little) guide pinned to the top of the forum. Hope you don't get lost in it. Good luck
"I don't know half of you half as well as I should like; and I like less than half of you half as well as you deserve."