Investing a large sum of money in share market - can anyone give advice?

Andy M asked:

I am in my late teens and after a couple years of work I have $50,000 (this to me is big money) banked that I would like to invest. However, I am not sure if investing all of the $50,000 is a good idea - Especially taking into account the recent market volatility. Therefore, should I look to invest all of it? or should I only invest a certain percentage of it?

Question posted courtesy of: Gary

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