Think of this game as a strategy board game, in the form of cards. You must compete against your opponents to become the first player to use all of your cards. However, the closer you are to victory, the greater the chance you will become a target.
It is often a good plan to remain passive, and wait for another player to make the first move. For once a queen is declared, a player may acquire the kingship, and from there, they can literally change the rules of the game. Download the rulebook.