Your split depends on your preferences. Some people prefer a 3 day split as compared to a 4 or 5.
It also depends on your recovery, everyones muscle groups recover differently and you should keep this in mind when pairing different muscle groups.
Here is my current split: 3 on, 1 off, 2 on 1 off
Day 1: Chest and Bi's - here i work bi's because it is my preference, i feel that tri's get a good enough workout and my bi's are behind my tri's anyway.
Day 2: Legs/Abs
Day 3: Shoulders/ Traps/ Calves
Day 4: Off
Day 5: Back/Abs- i put back late in the week after legs because I do deadlifts for back, but i also do romanian dead lifts for legs...just a matter of letting them recover
Day 6: Bi's/Tri's
Day 7- off |