Method of Salaah

Q: What are the different tasbeehat that we can recite in sujood besides سبحان ربي الأعلى?

Q: I read somewhere that you cannot lift your foot in prayer and it invalidates the prayer. But when I stand up from the sitting or prostration posture, I need to adjust my feet so that I am again facing qibla directly (my body seems to be a bit lost of the previous position). I heard it invalidates prayer. Hence if I am very slightly not facing qibla, I would just not lift my feet to adjust it. What should I do? 

Q: I know that one should read longer Qiraat in the first rakat than the second rakat and that one should not skip an in-between Surah between rakats unless the rakat one skips is long. This applies to Fard salaah. My questions are:

1. What is meant by "long" Qiraat? Is this the number of lines or the number of ayaat?

2. Does the Qiraat have to get progressively shorter for the nafl and Sunnah rakats of Sunnat-e-Muakkadah and Sunnat-e-Ghair-Muakkadah as well?

3. Can you skip an in-between Surah in the Nafl and Sunnah salaah?

Q: I heard that when reading Surah Fatihah, you need to make the sound of the “dal” in “wa lad-daaalleen” longer, till 6 seconds. However, it is difficult for me to count how many seconds and often I finish it in 3 second or so. Is my prayer valid even if I do it deliberately because I can’t count seconds when reciting?

Q: If a girl is wearing a huge ball gown for her wedding which is such that it is difficult for her to make sajdah in it due to the many layers, will it be permissible for her to perform one salaah sitting on a chair?

Q: Do we need to recite surahs in order as per the Quran Majeed?

If a person doesn't know this ruling before and afterwards he comes to know it, he recites in order, what is the ruling on this?

Q: In some coutries, ulama say that zikr (like Lailaha illahu wahdehu la shareeka lehu... zal jadda minkal jadd) which is done after prayers with loud voice is sunnah. We have never heard our ulama or Imamas in Pakistan doing zikr after prayers with audible voice. Can you please guide what is Sunnah?

Q:

1. Can one read multiple duas that come from the hadith after tashahud and before tasleem?

2. Can one read one dua multiple times after tashahud and before tasleem like: Bismillahi ala dini wa nafsi wa waladi wa ahli wa mali Or Allah humu ini aoothbika minal mathami wal magram?

Q: I was confused when exactly should one say "Rabbanna wa lakal hamd". Is it when you rise from bowing immediately or after you put your hands down and stand for a short while before going down? 

Q: I prayed asr with an imam. When I was in sujood, the row was tight and my elbows were touching my knees. If I remember correctly, I heard somewhere that you should not let the elbows touch your knees but rather spread them out. But is it essential for prayer to be valid?