Just follow these steps:
First go to the community market and click on: Show advanced options.
Then you click on All Games and choose CS:GO
After this click on the search-box.
and type: Katowice 2014
Then you click on the little button below.
After this scroll down to the tournament section and click on: EMS One Katowice 2014
If you want, you can choose some tags to find a specific weapon or something else.
Now you can click on search and choose the skin you want.
It's easier to search, if you click at the Price button; this will sort the skins ascending from low to high price.
After you found your skin, scroll down to the offers and hold your mouse on one of it, so you can see which stickers are on it.
The higher the price, the higher is the chance of a more expensive sticker!
If you want to pay more you can go to the next pages.
If you're still having any questions, write them down into the comments.