If you think GOOG is going to 600 by the end of next month (third friday of Nov), then you'd want to buy GOOG puts for Nov 12. Right now the GOOG Nov 12 620 puts are at $4.00 (that'd cost you $400 for one contract). If GOOG fell to $600, they'd be worth ~ $20 + whatever time value was left (so $2000 or more).
If this is your first trade and you're not really sure where to begin, then I HIGHLY recommend paper trading first. It'll save your bacon if you unknowingly make a mistake.
Also, whatever you do, do NOT let your options expire in the money (below the strike for puts, above the strike for calls). You don't want them to automatically be exercised. If you let one call of AAPL expire in the money and it were exercised, you'd be on the hook to buy 100 shares of Apple at the strike price of your option. If you let one call of AAPL expire in the money, you'd be on the hook to sell 100 shares of AAPL at the strike price (which means you'd first have to buy 100 shares of AAPL at its current price which is higher than the strike).
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