I have learnt from many successful investors that its a good idea to maintain various watchlists of stocks you want to track. The idea is to have an easy way to know if a stock has hit a particular price point such as 52 week low, Low P/E or a pre-determined price. I read in a book that the great Sir John Templeton kept a running list of buy orders with his broker at pre-determined prices. When the prices would be reached, those orders would execute. His rationale was that if he had to make a decision when he would see those prices, he may not be able to control his emotions of fear or panic.
Remember, these lists may help you generate ideas for further research. This is just a starting point for further research.
Here are some simple spreadsheets I have setup using Google Docs