1. At the start of the turn, you choose a character from the ones in your party who havent taken action yet. This character is given a time limit, and he is free to move around the battlefield and switch between items as much as he wants; the turn ends when he attacks or time runs out.
2. When you press the attack button, a gauge begins to charge up; you cant unleash the attack until its full. These charges can be stacked up to further strengthen your attack once you finally unleash it, and the closer you are to your targeted enemy, the quicker the charges will come. (Enemy attacks work this way, too.)
3. Once all three characters in your party take action, the turn is over. The enemy side does not get defined turns in this game; they can only move when your party is moving or attacking, and they can only target the character that you are currently controlling.