hello...
Thought I would try and help out.
First off all I had a look at your younger players and I can't find out what you are training. You have several 19 year old players and only 1 18 year old that you are selling. Since you are asking about how to train guards, why are you selling your 18 year old guard?? (I assume you are training guards??). His stats arent that bad, he wont be a Top Player but for the 4th and 3rd league he might be good enough.
I would, If I would be you concentrate on scouting and buying next season some fresh 18 year old guards with decent potential.
I think all guards, need all 6 first skills. Jump Shot,Jump Range,Outside Def.,Handling ,Driving and Passing. When the player is young I would try to raise Outside defense the most and now and than train the other skills. (OD is the slowest to train).
Hope this info helps, I am not saying you have to do this, there are many ways to success, but this is the way I would do it.
Good luck with your season and I hope you can avoid the drop...
Happy xmass too...