Carefully, carefully, carefully.
First, register at RealtyTrac. Then get the name of the lender. Take a quick vacation to Miami to see the property. Get a realtor to find out any problems for out-of-state buyers, and give you advice on this purchase. Reasearch local comps and rental histories.
If you can't go to Miami, is there a trusted person who can look at the property for you? Don't bid on what you haven't seen unless you are only gambling with this money.