Stock Choosing Strategy

Considering I am blind to anything related to stocks, I honestly had no idea what I was looking for in my investments. I pretended like I understood the big words and meanings. However, I tried to use my common sense. If a stock was fairly cheap and still going up, I would buy atleast 100 stocks. If a stock was fairly expensive and was still going up, I would buy around 50 stocks. After the first day, I would check to see who was int he lead and review the stocks with high percentage gains. Then I would quickly invest in more shares than they had bought. This way, when ever they decide to sell their stocks, I could sell mine and make more of a profit.