As for when to play him, the answer has to be once he's good enough - if you want to start him off as amazing, play him straight away but ensure he can handle pressure and that he fits into the overall team set-up. If you want to build him up gradually, make sure he has high mental stats, especially determination and professionalism, so he will be more likely to develop.
Keep him happy, it would be sad to have him become unhappy with his lot - setting your club as his favourite, along with a high loyalty rating will help there.
Overall my main advice would be to make his mental attributes high, so he's balanced, uncontroversial, committed to the team above all else and has all the tools in his head to reach his potential.
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