royshieh just for your information if someone win this game(or others), it's not us that have to add you, it's the other way around, you must add the winner or just send it to is email you can check this info in FAQ on the The New Gifter's Guide to Gifting there is this part

Sending the gift:

After your giveaway has ended, the winner will show up on your created giveaways page. You have one of two options when sending the gift...

Option 1: Copy the winner's email address (blacked out for privacy), head over to your inventory, select the prize and click 'send gift', and paste in the email address from your created giveaways page.

Option 2: Add the winner to your friends list, and invite him or her to a trade when you're both online.
After you've either sent the gift (Option 1) or traded it (Option 2) to the winner, make sure to tick the "I Sent This Gift" box on your created giveaways page.

Sorry about my English not a native speaker(writer). Thanks

why not answer my question first :'(

Well for a start you're not selling it.
And as for advertisement, only by word of mouth.