Your workout is very old school. Let's update it some.
Split it into 2 upper days like this (and I'm changing it some):
Chin 3xReps (max reps per set)
BB Curl 2x10-12
BB Row 3x10-12
CG Bench 3x12-15
Preacher Curl 3x12-15
Lateral Raises 3x12-15[/i]
Put abs and back extensions on lower body days. Pullovers after squats aren't necessary, but if you want to be old school about it, feel free to keep them after your 20 rep squats.
You could also split your Lower into 2 workouts:
Romanian Deadlift 2x12-15
Back extensions 2x12-15
Calf Raises 2x12-15
Deadlift 3x5 (I like low reps for DL)
Front Squat/Leg Press 3x10-12
Abs (whatever you like)
Calf Raises (different kind) 2x12-15[/i]
Yes, pairing 2 big lifts for lower body hurts. But it works.
However, something tells me you're going for a more old school 20 rep squat routine. Go with something tried and true rather than making up your own. You're new to training, so don't try to make your own programs until you've tried programs designed by experts. It's like trying to write a novel without reading any first to see how they're put together. You can read about the great novels all you want, but until you've experienced Dostoyevski for yourself, you'll never really understand.