Ed Driscoll at Instapundit links to a video, posted by the White House, describing Donald Trump's eleven life lessons. You could do much worse than follow them. I've listed them below if you don't need the video of Trump at various ages from his 20s up till now, which I enjoyed.
1. You're never too young to do something great.
2. You have to love what you do.
3. Think big.
4. Work hard.
5. Don't lose your momentum.
6. To change the world, dare to be an outsider.
7. Trust your instincts.
8. Believe in the American dream.
9. Think of yourself as a winner.
10. Be an original.
11. Never give up.
We can't all be Trump, we can't all be unique twenty-something prodigies or change agent outsiders. If all of us tried the result would be chaos.
Think of these as a shopping list, pick the ones that resonate with you. In my long, mostly successful life, numbers 2, 7, 8, and 9 have been particularly important. Your results may vary.