I've broken many fasts in the pasts through masturbating and eating/drinking. What's the best/right way to make them up?

I am 20 now and don't exactly remember when my puberty started. I've broken many fasts in the pasts through masturbating and eating/drinking. What's the best/right way to make them up? (2) When making up years of prayers, do I really have to count "First Zuhr Qadha", "Second Zuhr Qadha", "Third Zuhr Qadha" etc. till the end? Like "Zuhr Qadha Number 1265". (3) What if I die before having made up the many fasts and prayers?

بسم الله الرحمن الرحيم

(1) First, evaluate how often you have broken your fasting by masturbation and make qaza fasting of those days. If you have broken some fasts by drinking and eating intentionally then you have to make qaza as well as kaffarah. In kaffarah, you have to keep fast of sixty days continuously without a gap.

(2) Likewise, in salah as well, estimate as much salah as you missed, then start making qaza with an intention that I am making qaza of my first missed Zuhr salah or Asr salah. There is no need to say: qaza No. 1265.

(3) If you kept on striving your level best to make up the missed salahs and fasts; and meanwhile you passed away leaving a will while you had to make up some of salah and fast then it is hoped that Allah will forgive you by His mercy.

Allah knows Best!

Darul Ifta,