Jim Cramer kicked off his "RealMoney" radio show Tuesday with a listener email that asked how to get into the stock market. "I feel like I have the IQ of a cockroach," the listener wrote. "I don't understand how buying and selling stock is done." The listener wanted to know how to begin, who to call, how the money changes hands and how a portfolio gets made. "Can a person raised in the ghetto buy and sell stock?" the emailer asked. So Cramer dedicated the show's first segment to his "Introduction to the Stock Market 101." "First of all, ghetto, cockroach, IQ -- stop. We're all equal in the eyes of the market," Cramer said. And the first step is to open an account with a broker. There are "literally dozens," he said. And if you don't know where to go, he reminded listeners that he got his start by opening an account with Fidelity based on an ad he saw. "There was nothing more to it." You have to find a brokerage that is comfortable for you and that fits your needs. After the account is set up, you put money in it to buy stocks. The brokerage will lend you money to buy stocks, but Cramer said to never take that loan. "We don't borrow money to buy pieces of paper," he said. If your account is online, you can just buy and sell by putting in the number and clicking. However, he prefers to have a human at the other end of the line. When you buy a stock there are two main kinds of orders: market orders and limit orders. A market order means that you don't specify at what price you want the stock. That means that you simply say to buy X shares of Y company, and don't specify a price.