a gin is a set amount of credits that u can spend to purchase the item ...and u win the auction...and the seller sends it to u..if u check down at the bottom left of the screen and see credits u can do surveys and stuff to earn free credits...or u can list auctions..once u have like 20 completed auctions all with great feedback.then u may list your items with gins and also u get badges and trusted sellers get their won credits immediately following the auctions at that time....good luck.start small.coke cap codes send in emails no shipping costs..things that fit into envelopes are my favorites..til u get trusted sellers badge then u can auction off bigger items for far more credits..