Finish reading the Intelligent Investor. It gets better. It's the foundation and you would do well to start with that book
Then read Common Stocks and Uncommon Profits by Philip Fisher
Then read Buffett's Partnership Letters and his letters to shareholders
Then find Margin of Safety by Seth Klarman on the internet, download it and read it
Then read everything by Joel Greenblatt
Then make sure to read the Intelligent Investor again, and pick up on everything that you missed the first time and didn't quite understand.
That should be enough to get you started, and at least get you thinking in the intelligent investor's mindset. Having the mindset is far more important than learning a formula.