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.
personly i like to play mid range you get to high and the weapons are just insane i like playing midrange with rare level weapons myself the whole epic and legendary stuff just to expensive and changes game dynamics to much