Congrats! eBay will send an automatic reply to the winner and yourself via e-mail relaying information about each other (e.g. your addresses and contact information, as well as the total, including shipping). It is now in your hands to make sure the transaction happens. Using PayPal (an account where the buyer can purchase your item via credit card directly into your checking account) or other forms of payment are available. Cashiers checks or money orders are the best options if you want to avoid the PayPal route. Send an e-mail to the buyer, reiterating your information and remind them of your due date for the payment. Now you wait….
Once you receive payment, ship your item. Are you done? Almost. Make sure to contact the buyer again and ask for feedback. The more the better.