There were a few threads a while back which might help (search off-topic for "investing 101"

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You are smart to try to learn before jumping in. I think right there you are going to greatly increase your chance of success. There's an old saying "Before you invest, investigate".
Don't be discouraged when you find that, like everything else, there's always more to learn.
tagej is right when he says don't jump into something because your buddy said it was a sure thing. I well recall a member here saying a few months ago that JDS Uniphase was a sure thing. Could only go up, leader of its industry, etc. Well, anyone who bought that stock in July at 140 could sell it today for a 50% loss. Recognize the difference between investing and gambling. A lot of people call themselves investors when they are really gamblers.
As you read, you'll find that many well-respected people disagree on major points. Realize that if there was a sure-fire way to get rich, everyone would know it.
It's impossible to pick winners every time. But the difference between coming out ahead and losing is how you handle it. A lot of people hold on to the losers because they are sure it will come back. Then they sell the winners to "lock in" profits. That's the exact opposite of what you should do - sell the losers and keep the winners! But there is so much psychology involved people get their judgment clouded.
To get started, I'll recommend "How to Make Money in Stocks" (revised in 1994) by William J. O'Neil, and "How to Buy Stocks" (revised in 1994) by Louis Engel. O'Neil's book uses some confusing terminology that he has developed himself (I'm well-versed in investing, and I was having trouble!) but you should be able to follow his basic premise. Engel's book is good for learning a lot of the everyday terminology and theories of the market.
Note that both books focus on individual stocks, but for a new investor a mutual fund is probably a better choice and much less risky. Check the morningstar.com site for a lot of information on mutual funds.
Best of luck to you with your investments.