Steam has a deal going on right now where you load your wishlist up with games you are wanting and when you visit Steampowered.com or the store tab on Steam and click the daily deal, you get entered into the daily drawing.
Literally that’s it. This is one of the reasons I love Steam. 10 people a day are randomly selected to win. Just make sure you have something in your wishlist and make sure you click on the daily deal every day to be entered.