Double Closing

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Hello everyone,
I have a few questions about double closings, who is actually paying the closing costs for both closings? When I get the buyer do I then contact the title agency and tell them i need a double closing? What do i need to bring with me to closing and do i tell the buyer that im doing a double closing and the seller? Any help would be appreciated, Im in contract with a bank Owned property....got a steal on it.....now want to sell it?
Also I had to put a deposit down when a signed the contract, do i get this back or is it part of my "finders fee"