The advice of your friend to look for a mentor/teacher is wise and taught by most trainers. However, you must also know that asking Bill Gates to be your mentor/teacher will not necessary make you a billionaire like him. You should study what your friend did after he learn from his teacher that made him a millionaire at 30.
I have taught over a million people in MLM how to do the MLM business but what they do after they have learn from me is sometimes unbelievable. I will be insulted if some of them claim they are my students.