Witr and Nawaafil

Q: If someone offers only the fardh salaah and leaves out performing the sunnah salaah, then what is the Islamic ruling? Is it a sin to leave out the sunnah salaah and only offer the fardh?

Q: Is chaasht a sunnah salaah that Rasulullah (Sallallahu Alaihi Wasallam) performed and is there any Ahaadith regarding it?

Q: If a person commences performing four rakaats sunnat ghair muakkadah, before Asr or Esha, but due to the jamaat salaah starting, he only performs two rakaats instead of four, then will he need to perform these four rakaats later on after the jamaat? (The reason I am asking is that I have read that once we start salaah, even a nafl salaah, it becomes waajib to complete it.)

Q: For the four rakaats sunnah before isha, do we pray in pairs or four rakaats with one salam and for the four rakaats after esha is that in pairs or four rakaats with one salam and what intention do we make for these four rakaats?

Q:

1. Regarding any nafl salaah, I would like to know if it is permissible to read the qiraat aloud, for purposes of dhor?

2. If it is, should one perform the salaah as though leading a jamaat, i.e. say takbeer for postures aloud, etc.

3. Do the same rules above apply for qadha salaah as well?

4. What are the rules for performing nafl salaah in jamaat, e.g. with one's spouse or household?

Q: I want to read isthikaara for a marriage proposal. How many days should it be read for?

Q: I had offered 2 rakaahs of sunnah after zuhr, but I forgot that I already offered it. So I offered it again, but I mistakenly faced the wrong direction instead of the Qiblah. Should I offer the sunnah again?

Q: What is the sunnah method for women that should be adopted at the time of solar eclipse?

Q: What is the sunnah qiraat or surahs to be recited in the witr salaah?

Q: Suppose I come to the masjid and I have little time before zuhr jamaat to pray the 4 sunnah muakkadah. Can I pray 2 unit rakah before fardh and 2 after fardh so that I can join the jamaat or the 4 units cannot be split?