Log in every day to claim useful rewards
Every single day that you will log in to the game you will be able to claim useful rewards and player packs which will give you free players! I really suggest that you do this even if you won't play the game that particular day because on the 30th day that you log in you will be able to claim 240 Coins - that's only on the 30th day - up to that day, there are plenty of other useful rewards!