Pectorial Exercises:

Inclined Bench Press: Lie on a incline bench, face up, with your feet flat on the floor. Raise the weight by striaghtening the arms above the chest and then slowly lower the weight back down to the chest, slightly above the nipple line. Hold your elbows in close during the exercise.
Exhale as you raise the weight and inhale as the weight is lowered. Do not arch your lower back. This exercise can be performed with a close, medium or wide grip on a barbell, or with dumbells.

Paralell Dips: Stand between parallel bars and lift yourself so you are held up by your arms and your arms are straight. Keeping your elbows in close to your sides, lower your body down as far as you can. Press yourself back up until your arms are straight again. You can also hold a dumbell between your feet for extra resistance.

Serratus Exercises:

Inclined Flys: Lie face up on an incline bench, grasp a dumbbell in each hand and place them at arm's length above your shoulders with palms facing inward and the arms straight. Using a semi-circular motion (as if you were hugging a big barrell), lower the weights out to each side of the chest, keeping your elbows slightly flexed. Return to the starting position.

Declined Flys: Lie face up on a decline bench, grasp a dumbbell in each hand and place them at arm's length above your shoulders with palms facing inward and the arms straight. Using a semi-circular motion (as if you were hugging a big barrell), lower the weights out to each side of the chest, keeping your elbows slightly flexed. Return to the starting position.