Since bench works those 3 muscles, you should have one day with those 3 muscles, it's called a push day. Do bench press 5x5,overhead press 5x5, and one isolation for shoulders, one for chest and one for triceps all 3x12 or something.
Next day do pull day. Core, back and biceps. Do pull ups and barbell rows 5x5 and again one isolation for each.
Leg day should be squats and I also do deadlifts on leg day. 5x5 and 3x12 isolation exercise.
4th day do cardio
Start over from push day and enjoy ez gains