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A member orders a book off of your bookshelf and then requests another book for their "freebie". You receive the credit for the ordered book and then send both books to the member. I would suggest asking the requestors to post their order/choice as well as pm you so that you don't have orders for "freebies" that are already promised to other members. Good luck with your deal!
It's easy. Somebody would order one from your bookshelf and then they would send you a Private Message (PM) telling you which other book they wanted for free. You then mail them both books and remove the free one from your bookshelf.
The key of any # for # deal is that the last number is what people have to order the regulare way. Then subtract the second number from the first to know how many they get free. Hope this helps.