Moneypenny is right, the quickest was to lose money is to try pick a share, especially as a beginner. BUT managers take fees, usually a lot of them. Depending on how much money you've got to invest, I'd recommend you speak to an adviser who charges a fee to see, but not an annual fee on your account.
Why you shouldn't pay annual fees:
http://www.investorchallenge.co.za/those-fees-are-blatantly-robbing-you/And why you probably shouldn't try pick shares:
http://investorchallenge.co.za/how-to-lose-money-in-the-stock-market/