The length of each phase will depend on results and progress, but I think that I will do phase 1 for 3 weeks , phase 2 for 5-6 weeks , phase 3 for 4-5 weeks, phase 4 for 8 weeks.
As for exercises I will use only compound excercise for phase 1 and 3 (squat, deadlift, bench press, military press, pull/chin ups, rows). For phase 2 and 4 I'll add also some isolation exercises for each muscle group.
I can't be more accurate for now because I have not already written the workouts.
I would just like to know if you think that each part of this training will benefit from the previous phases in order to gain muscle mass.