Witr and Nawaafil

Q: Which salaah is more important, Sunnat Muakkadah or Tahajjud?

Q: Regarding Shukar Salaah, I read 2 rakaat to thank Allah for all that he has given me, I'm content with all that I have, but I tend to read it 3-4 times a day. Will reading it once a day be sufficient? It's more like OCD, where as if I don't read it, I might lose what I have. So will reading it once a day be fine?

Q: Can one pray nafl salah after having prayed sunnah salah if time permits before the jamaat for the fardh salah starts?

Q: Can a waladuz zina (illegitimate child) make imamat for taraweeh salaah in Ramadhaan?

Q: Could you please inform me about the minimum rakaats of Tahajjud namaz and can I perform it about 20 minutes before fajr azaan? 

Q: Can I perform one rakaat witr or is it compulsory to read three rakaats witr?

Q: Can we perfrom Tahajjud Salaah without sleeping because I am awake the whole night till fajar? 

Q:

1. Is it compulsory to pray sunnat-e-muakkadah namaaz immediately after finishing the farz namaz?

2. Can I pray farz namaz with jamat in the masjid and then go home and pray the sunnat-e-muakkadah namaz?

Q: I have a lot of gas when I wake up in the morning for fajr. It is almost an everyday thing. Sometimes the feeling for breaking wind is strong and I pray the fardh prayer first then the sunnah 2 rakahs in case I miss the prayer if I have to break my wudu. Is that valid given my situation of having lots of gas in stomach?

Q: Does one have to make qadhaa of sunnah salaah?

For example, if a person misses the sunnah salaah for Zuhr, and performs 'Asr, should he perform the qadhaa of Zuhr sunnats?