What advice to under 20 entrepreneurs?

Number 1, Be you. Find people you want to love you, and provide with them value. Love them and they will love you back with business. Number 2, Think, but think inside a market. Never think outside of a market. A market is a place where people pulls out wallet or credit cards. Only thinking inside markets are well grounded. Number 3. Start. Don't wait for a perfect idea to start. The first start is a failure, called learning. No one on the first try, and there is nothing to be shamed.