Method of Salaah

Q: I believe that in a book I read titled, Laws of salah, written by Muhammad Ilyas Attar Qadari Razavi (Dawat-e-Islami) it said on the hundred and fifth page these following words:-

'After you finish surah Fatihah, utter amin in a low volume and then recite either three short ayahs or one long ayah that is equivalent to three short ayahs or any surah such as surah Ikhlas.'

I had a query based on the last line of this paragraph. When it quotes, 'or any surah,' do you think that this is implying that after surah Fatihah has been recited you can recite another surah, or is it suggesting that after surah fatihah you can recite an ayah that is equivalent to another surah, or do you think that it can be referring to both?

Q:

1. Should I be silent behind the Imam in the 3rd and fourth rakah of isha and 3rd rakaat of maghrib?

2. If the muqtadi recites behind the imam in loud and quiet salah is he sinful for it? Please clarify.

Q: Can I recite Surah Faatiha in quiet Salaah because I heard this is the opinion of Imam Muhammad (Rahmatullahi Alayh). Please clarify.

Q: Why it is not permissible to read suras loudly in zohr and asr prayers as of the remaining prayers?

Q: I just want to ask when performing the tashahhud, when will I raise my finger and when should I place it down? 

Q: Can I read the following dua in my salaah? (Eg in sajdah, end of tashahhud)

توكلت على الحى الذى لا يموت الحمد لله لم يتخذ ولد و لم يكن له شريك فى الملك و لم يكن له ولى من ذل و كبره تكبيرا 

Q: Shoud the muqtadi behind the imam stay silent in the third rakah of maghrib and the third and fourth rakah of isha. Please clarify.

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

Q: In Salaah, when sitting in jalsa position, is it sunnah to sit on the left foot with the right foot raised and the toes of the right foot facing the qiblah? The question is when sitting on the left foot is it also a sunnah to have the toes of the left foot facing the Qiblah?

Q: In order to create more space in the Musjid for Musallees on the occasion of Jumuah, we ask all the Musallees to move forward one step. The problem is that those Musallees in the first saff who are in line with the Mimbar, when they step forward, they have insufficient space for sajdah and thus make make sajdah on the step of the mimbar.

1.Is the Salaah of these Musallees valid?

2.If the Salaah is valid, is it Makrooh for them to make Sajdah in this manner?

3.In these circumstances, is it permissible to leave a gap in the first saff in line with the mimbar?