There is not THE answer. But, there are some lines you can follow.
1. There is a difference between U21 and normal NT. U21 is more about main skills (big men train big men skills first and opposite), whereas NT trains the oppodite direction (e.g. Big men should train guard skills first, because it takes longer to train them for big men).
2. Make a plan how he should look like at the end and than direct the training after the plan.
3. If you have question, ask me
I don't know what you bought. But under 1) you can find my answer
Hell Ya - We are coming from the North to conquer your arena ...