Generally, you step on the same pedal for which way you want to yaw - left pedal to yaw left, right pedal to yaw right.
For normal flight, a little rudder in the direction of your turn will keep the little ball centered thus keeping your airframe going through the air with the least drag.
For combat flight, do whatever you need to get out of the enemy's gun solution while gaining position for a shot on him. Don't worry about keeping the ball centered during combat maneuvering.
Opposite rudder from the turn will let you skid around the turn, bleeding airspeed quickly. Rudder into the turn will allow you to turn the nose around quicker than without any rudder input.
These are very basic and general statements, but then I'm not a real pilot and am myself very basic and general.