How much do you expect to charge for shipping? Do you accept paypal? What do you mean by "could win up to 5 games" Is it tiered? You need to include that information, otherwise you will have to send all 5 games no matter what the winning bid is, or risk a bad review and the buyer would likely get their credits back and leave you with a negative feedback.
Tracking is a code you have to specifically ask for at the post office, it normally costs extra but it allows you to see where the package is at during delivery if you type it in on the mail services website. Also on listia rules if you provide a tracking number and a buyer claims they never got the item you would win a dispute. It is preferred as it shows proof you actually sent the item.