So, my advice to you is to download the Training Simulator:
(229484.1).
Use it to figure out what you want your player to look like, how much time you're willing to spend training that player, what that training will do to your other trainees. Weigh the costs/benefits. Think about whether or not you'll be able to win while training. Think about whether you'll be able to pay salaries and when salaries will force you to promote or sell. Do what's gonna be good for your team.
You're in D.IV. I would say you want prolific-sensational OD for a starting guard if you want a shot at promotion. Offensive skills and secondaries are the gravy after OD as far as I'm concerned.