Hey, im currently about to start gaining size for a few weeks. My diet seems to be looking good although i havent started yet, i plan on starting saturday. i was just wondering for gaining size how i should split my workout into days.

I plan to workout like this
Day 1 Chest + Biceps + Abs
Day 2 Back + Triceps
Day 3 Shoulders + Legs + Abs
Day 4 Arms on their own + Abs

How would you put these days into a week plan? like monday chest and Bi's, tuesday off? considering i want to gain size. Would you change it to Back and Biceps etc??

Thanks for all the help