i have no doubt this thread will be closed but i will answer anyway
players need the mental stats to get good potenial e.g. they have to want to put work into achieving their potenial
they need game time at high level and good training facillites aswell
training is big aswell and what moves and other things you suggest and make sure you know how to train effectively cant stress that enough.
dont just play youngsters in cup games you might have to drop points by playing them
Thanks and What's the best training to put them players on? And why would it be closed?