Go to college. Most brokerages will only hire college educated people. Most brokers are college graduates with degree(s) in finance, economics or business. Pass the General Securities Registered Representative Examination (Series 7 exam), administered by the National Association of Securities Dealers. Most states also require the Uniform Securities Agents State Law Examination (Series 63 exam) and the Uniform Investment Advisor Law Exam (Series 65 exam).
Risky business. Mostly you have to know the business well. And get to constantly keep an eye on the market.