An advanced trainer is fine. For the 18 year old, I would try to make him a PF, while forming the 19 year old into an SG/SF. I would train all guard skills this seasons, starting with OD until they both hit 9. Next, train 1v1 Guards or Forwards (your choice) until their HA/DR is at 7-8. I would also throw in a couple weeks of PA. Then during the playoffs/offseason, you can decide if you want to train JS or more OD.