You mine, we make an educated guess about what you might get when the block is found and put it in "Estimated reward".  These bitcoins are not guarantied, we just make an estimated guess.
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The money will sit in your transactions table, where we attempt to pay it out.   This table shows when the transaction was scheduled, whether it is still to do or confirmed, and when the actual transaction is done, the money has been payed out and you will see your money in your bitcoin client.