Questions about this Delta Skymiles card

Questions about this Delta Skymiles card?
This one: http://www201.americanexpress.com/getthecard/learn-about/Gold-Delta-Skymiles If I purchase a flight from Cleveland to Las Vegas, does that mean I get 20,000 free miles I can use anywhere? I would like to visit my friend in Croatia, which is around 5,500 miles away. Would I get this flight for free with the miles I earned then? Sorry if this sounds stupid but I'm pretty clueless about this sort of thing..
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20,000 miles does not let you travel that far. Go to the Delta website and look up how many miles it takes to get a free flight to Croatia. I'm sure it will be a lot more.