It is important to every investor that chose a good broker and other important work in stock market is to make your own homework. Know the profitability of the company. Keep an eye on the trends associated with this stock and its industry. Make a game plan and stick to it. Buy a stock only at the price you intended to buy it and sell it at the price you intended to sell it, always protecting yourself with a stop loss order to prevent you from losing everything if the price happens to crash.