How Do i email Someone a game because they won a giveaway and this is my first giveaway.

Go here: http://www.steamgifts.com/manage/created
Click on "Send Gifts", and their email will drop down for you

lick on the green bar that appears when you visit the front page or go to giveaways at the top and select created, it'll come up with what you have given click on the giveaway you want to send and a little drop down box will appear wit the user's email

Is it a steamgift or a key? If it's a steamgift, initiate trading with them and then offer it, approving the trade without anything on their end (there's another way to do it as just sending a gift, but i don't know how to do that). If it's a key, just email it. I wouldn't advise messaging them the key on steam because they might need to copy it twice or thrice...I've been having issues with steam crashing when I tell it to approve stuff.