1. Learn to network and really connect with people. The people you meet at University will be the people you have in your network in the decades to come. And in my experience as an entrepreneur these friends can be a tremendous asset and one that must be build with foresight.
2. Seek and find mentors.
3. Get started now creating businesses. It's never to soon to start. If you want to learn to be a successful employee - work for a successful business owner. If you want to learn to own successful businesses - become a business owner and learn the "how to" in the greatest school in the world for entrepreneurs... the school of hard knocks.
Best of luck!