What is the Proper method on Splitting my workout?

The purpose of split training is to give the muscles you‘ve
just worked a break. It’s only practical if you’re working out at
least three times a week. If you’re not hitting the gym that
many times, stick with total-body workouts. Here are three
good options to try:
1. Push-Pull method: Workouts are divided according
to muscle function. One day you work push muscles. Your
push-workout could include chest, triceps and front
shoulders. On the next day, you work full training with
exercises for the back, biceps and rear shoulders. The
advantage: similar groups of muscles work together
intensively but for a shorter period of time.
2. Contrasting muscle-group method. In this
method, you work for different muscle groups. For example: on
one-day biceps/triceps and abs/lower back and on the next
day chest/upper back as well as the quads and hamstrings.
The advantage: every muscle works to the max since it’s not
tired. This workout can be more time-consuming.
3. The upper body/lower body method. Split
your body into two muscle groups. Work your legs and lower
back one day and your arms, chest, shoulders and upper back
the next. The advantage: you prevent overexerting a certain
muscle part, even if you work to the limit. The disadvantage:
you skip complex total-body exercises.

Muscle Workout Guide