Stock up on mana potions for The Sorcerer as she is fully dependent on her skills because her basic attack is really weak.

Simply login each and every day to collect some free items, even if you don't have to play.

You have the option to buy the chests in the Mystic Chest, but you can open two of them for free. Two quests are given a time limit and once it has passed you can open the chests for free.

Playing the story will grant you free items, diamonds and such, three stars on all levels you can open three different chests. Three stars to open the first, six for the second, and 12 for the third.

Joining a guild is one of the most important things you can do as the better it is the chances of you getting better items increases.