I'm gonna be honest with you, Looking at your roster I can't see any reason to use a world renowned trainer on any of them, and for most it's not even worth training. I would say build up some money and go get some worthwhile 18yo's. Also you will be fine with an advanced trainer, try and get one with salary under 20k. Try to work on 1 position training, basically pick up 3 trainees, and fill your team out with some solid veterans. Also just so you know at this level you do not need to worry too much about potential (no reason to get MVP or something), I would say atleast All Star potential would do nice.