i highly recommend the origin of wealth -- an amazing book
mark douglas' books can be helpful,
how to make money in stocks by o'neil,
steenbarger's book
george soros' books
hank pruden's book
you want to learn what a trading plan is, and you want a trading plan that will work in irrational markets (since humans are not rational etc.), has some risk mgmtn (risk does not equal volatility), rules to buy and sell, etc.
hope this helps,