Do not play stock market is my advise, losers are more than winner in this dangerous play with money game.
Before you spend $0.01 make sure you know what you're doing, how to do it, why you're doing it AND understand the rules & regulations that govern what you're trying to do.
Buy stocks that will go up. If you can't do this, then buy a broad mutual fund. VTSMX - Vanguard's Total Market Index.
Buy low and sell high.
If something is about to become a bad investment, sell it off.