Qa’dah and Salaam

Q: Is my Salaah valid if I read some other Durood instead of Durood-e-Ibrahim?

Q: Will my Salaah be valid if I omit the dua and end with durood-e-ebrahim?

Q: I would like to know the correct procedure of salaam at the end of Salaah. Is it Assalamualaikum warahmatullah or Assalamualaikum only?

Q: In the last Tashahud, is the dua recited after durood or before durood?

Q: Can one move the index finger during tashahhud? Most people don't move it once but keep on moving it. If one can kindly give me the refrence from Qur'an and Hadith.

Q:

1. If one happens to omits portion of Durood Ibraaheem due to one forgetting it or making a mistake, is the Salaah valid?

2. If one happens to recite Tashahud and one repeats the portion( Ash Hadu...) where the index finger should be raised, perhaps due to getting stuck, should one raised the finger twice?

3. If yes, and it was not raised twice, is the Salaah valid?

4. Whilst in Salaah, during Durood Ibraaheem, one adds the words "Sayyidina" before the words and Names Muhammed (Sallallahu Alaihi Wassallam) and Ibraaheem (Alayhis Salaam), is the Salaah valid?

Q:

1. I have observed some Muslims during Salaah at the time of atahiyyaath they shake the index finger till Salaam. Did the prophet (Sallallahu Alayhi Wasallam) do the same?

2. Whenever the Muazzin recites ash Adu Anna muhammadur rasoolullah some people touch the eyes and then touch the lips thrice. Did the prophet (Sallallahu Alayhi Wasallam) do the same?

Q: Can you teach me or tell me the attahiyat after the second rakaat and after the last rakaat? Because I doubt if what I had memorized was wrong.

Q: Whilst performing a Qada prayer, one had just finished reciting "As-Salamu-Alaykum" of the first Salaam, and before one could complete "Wa Rahmatullah" (and even before the second Salaam), one's wudhu broke. Is this prayer to be repeated?

Q: Is the salah valid if during the final sitting in salah I repeated the durood ebrahim from the beginning despite having recited more than half of it due to a mistake I thought I made during my recitation of the first part of the durood?