Im new and i need help please!

[zaid]

Hello everyone, Im a 15 year old male. mesomorph , i have been training for almost a year and a half now. I started of with push ups and i wasn't really consistent and then trained for a few months and all i did was isolation movements and stopped for 2 months. In these few months where i did isolation movements i over trained and I just noticed. However, since the past 6 months I didn't stop training except for 2 weeks due to exams.
One of my biggest problems i always face is my routine.
Since the past 6 months i have been literally changing routines EVERY FEW WEEKS! like 2 -3 weeks.
Because everyone told me something different.
Anyway i was looking through the internet for the past few days for programs and i passed my this one , i looked at how it works and i actually liked the idea of changing the reps every week.
But I need help in making a routine , can anyone please help me.. i don't know how many exercises should i do per muscle group?
My weaknesses are mainly my back. specially lats , lower back,Upper chest / pecs and lower chest.
My arms aren't bad however, i want more size.
Shoulders not bad.
My goal is overall size / mass.
Nutrition wise don't worry , i eat like an animal to be honest hahaha.
Sometimes i lack sleep , which I'm trying to fix.
Anyway i need help in making a routine and i was wondering if any one could help me please!

Thank you in advance
Regards;
Zaid

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