Calculating Qadha Salaah

Q:

1. What are the conditions of a baaligha? I started having vaginal discharge at the age of 8, but only began praying and fasting at the age of 11, which is when I first got my period. Must I make up 3 years of prayers and fasts? If I had masturbated before having my first period, and do not recall excreting discharge with any coloration, was I baligh?

2. Can I make up prayers with intention of "this prayer or that"? I have some fajr prayers to make up for (I have no idea how many as I used to sometimes pray them at the time when one should not to sajdah).

3. I also have to make up 2 rakat nafl and sunnat prayers that become wajib when one breaks them, which I did often. So, when I am let's say doing maghrib prayer, for the last 2 rakats, can I make the intention of "either maghrib nafl, fajr fardh, or any wajib"?

Q: After I became baligh, I would offer my prayers but mostly I would miss them. I've missed my prayers and I don't know how many prayers I've missed. It's uncountable. How can I offer my missed namaz? How will I know that my missed prayers are done? Is it possible if I offer salat-ul-toba and never miss my prayers? 

Q: I have done some stupid things like missing my Salah. I have missed Salah for few years since I became an adult but I also missed my Salah a lot when I had a job and I now I don't know the exact number of Salah I have missed. Do I need to make up all Salah I missed? I have a habit of recording the qaza Salah down and praying it at a later date. Alhamdulilah now I read all my Salah but what should I do about all the missed Salah?

Q: I have been praying since my teenage years but I still missed some prayers at my early age. How can I complete those qaza prayers? 

Q: I have about five qadha salaat to read but I don't know what salaat they are. Can you please explain to me how I should make qadha of these salaats?

Q: My question is that, if a person deliberately left many prayers (namaz) then how can he complete them?

Q: Can you work out qadha for fajr, zohur, asr, magrib, isha and 3 witr for me from the age of 13 years till the end of 17 years. Basically from the time I became baligh.

Q: I do not know how many qadha salaah I need to make. Does moulana have any method to then actually read those qadha salaah

Q: If anyone starts to offer 5 times namaz at any time of his life, so is it mandatory for him to offer all the due salats (Qaza-e-umri) first, which he has not been prayed since he was 12 years old?

Q: In calculating all one's missed salaahs in life, does one start from the age of 12 or 15 if one cannot recall when one had become baaligh?