What courses would you take in college? And what university degree would you need?
What you buy/sell depends upon many factors such as how much capital is available, goals, timeline, risk tolerance, liquidity needs, etc. We generally are required to keep our accounts at the firm we work for as all of our trades have to be monitored by our compliance department to prevent insider trading and front running so we pay whatever commission our firm decides to charge us. I have no idea of a percentage that become wealthy as the term "wealthy" is subject to interpretation. Business/finance degrees are what most brokers start with although a degree is not required, passing the series 7 and 63 or 66 is required. In reality an in depth working knowledge of the market and trading is far more valuable than a degree. Self-education from education provided by brokerages and experience are irreplaceable. Nerds who can crunch numbers and marry the art of picking trades with the math behind them generally do well.
You are not going to find a Stockbroker on Answers. These are busy professional people who spend their spare time in swanky bars and clubs. They are not Nerds searching the internet for something to do. Most of us on here are either retired or unemployed.
UK
What do you sell? What is the average commission? Percentage of the people that become wealthy?
What courses would you take in college? And what university degree would you need?