When Should I Buy Stock? And how much should I buy?

Have your own personal goals.
Have a good investment philosophy and strategy.
You don't need to know everything to get started.
Seek a mentor.
Most mistakes happen early on when decisions are made on emotion and
when investment principles are not followed.
Not all mistakes will result in financial ruin.
Don't procrastinate!
You learn better while doing.

Warren Buffett: Game Pressure

"The stock market is a no-called-strike game. You don't have to swing at everything--you can wait for your pitch. The problem when you're a money manager is that your fans keep yelling, 'Swing, you bum!'"

Source: The Tao of Warren Buffett, by Mary Buffett and David Clark, via Engineeringnews.com

Read more: http://www.businessinsider.com/warren-buffett-quotes-on-investing-2010-8?op=1#ixzz1oXGjSl1y