I want to be a billionair like Bill Gates.

Several students didn't finish their homework yesterday. So I said,"Okay, don't do it any more. Write a plan about your life in the future. Tell me how you can do with it."
Today I received a piece of paper says,"I want to be a billionair just like Bill Gates. I will have a Ferrari and a convertible car. I know it not easy, so I must try my best at present."
Then what can I say to him? And what should I do?