Play games
Choose the game that interests you and play itfor free.
Complete the quests
Every game has some quests for which you will receive Soul Gems.
Receive rewards
You can exchange your Soul Gems for Steam Wallet top-ups, game keys, CS:GO Skins and other rewards.
this mission is probably the easiest of all of the ones you can do. You can reach level 7 in a day, level 9 in 2 days and level 10 is 4. by a week, you'll be level 11.