Sunan-e-Muakkadah

Q: Does one have to read a surah after surah faatiha in the 3rd and 4th rakaat of the sunnah namaaz for eg. 4 sunnah of zohr or asr?

Q: If I miss my four sunnats of Zuhr before the fardh, when should I read them, after the two sunnats or before the two sunnats?

Q: Which is more preferred and rewarding? Sunnah and Nafal Salah at home or at the Masjid?

Q: Could one defer praying the sunnah salah if one prays the fard on time. This could be due to shortage of time at work in non muslim countries.

Q: During weekdays, I perform Zuhar and Asr on the staircase in the office. So, there is not much convenience and hence I miss out zuhur sunnah salaah on a regular basis. And also I perform Zuhr about one hour before Asr time, so that I do not have to do wudu twice. Please advise.

Q: I have many years of qadha salaahs. I need to know if I can read my qadha salaah instead of the sunnah salaah. I know that when I am a musaafir, I am exempted from reading sunnah. What about when I am a muqeem? When fardh salaah is more important then sunnah, then please advise if I can read all my fardh qadha salaah in place of my sunnah of zuhr, maghrib and esha.

Q: If a person starts reading the four rakat sunnah before the jumaah khutba azan, and azan begins, what do i do? Make it 2 rakats, or read all four rakats? If I start my sunnah before the azan of the khutba, and know that I can finish the full four rakats before the azan ends, can I perform the four rakats?

Q: Can you give the proof and hadith in which the prophet (Sallallahu Alayhi Wasallam) prayed four rakaats sunnah at once. Someone is saying that the prophet (Sallallahu Alayhi Wasallam) prayed them 2 then 2 so can you give the hadith and its strength?

Q: Which sunnat salaah if left out will it be sinful?

Q: I have read that four rakaats (sunnat-e-muakkadah) before Zuhr salaah are equivalent in reward to Tahajjud salah. Is this proven from the Hadith?