It all depends on what type of trading you want to do. Swing trading? Day Trading?
The book I have been reading is: 'The Successful Investor' by William ONeil. I like this book because it's a very tested system of trading and it just makes sense. I have been paper trading this books system for a little bit now and have done pretty well with it. Another thing you can do is go to
http://investors.com and get a trial subscription of IBD. The person who founded that web site and the newspaper, also wrote this book. I think you will find that it is the most researched tool that you can find. Hope this helps!