If you have to ask such a question, do yourself a favor and first read about a dozen books that explain investing fundamentals. Then ask yourself if you have the particular set of middos required to succeed in the market. most people do not.
A short list to get you started:
– The little book that beats the market, Joel Greenblatt
– How to value a business, Frank Singer
– The intelligent Investor, Particularly chapters 8 & 20.
– F Wall Street, Joe Ponzio