Investing in the Stock Market

I am reading up on finance books and also on investing in the Malaysian stock market. Though I have already opened an online trading account with Public bank last year, I still dare not trade yet for lack of knowledge. Now, as I read more books on investing and financial ratios like ROE or Return on Equity which measures profitability or PE ratio for Price Earnings Ratio and Debt Equity Ratio, etc. You also need to know how to calculate intrinsic value or book value of the share in a company so that you don't over pay and buy at a discount, preferably below 2/3 its actual price.