Wearing purdah and going for Jamaat

Q:

  1. Is covering face fardh on women or just wearing burkha which covers the whole body except hands, feet and face suffice?
  2. Is going for jamaat for dawah purpose from one place to another correct in islam? Is it part of sunnah? And what about reading fazaele aamal book? I heard few scholars saying just to follow sahih hadith and not these books. Please clarify.

Asking for one's due

Q: I am boy who is 18 years of age. My father passed away 16 years ago. I have been living with my maternal grandparents ever since. Do
I have a right to my fathers estate knowing that my paternal grandfather has full power over and he has cut off all ties with me ever since? What do I do? Do I confront him and ask him for what is mine or I turn a blind eye towards it?

Few questions regarding Salaah

Q: I would just like to get clarity on a few aspects of Salaah (hanafi).

  1. What is the correct way of performing ruku, does one say Allahu akbar first and then bend down, or does one say Allahu akbar in the motion of bending?
  2. In witr Salaah, does one drop their hands and then raise it for dua Qunoot, or can one raise their hands directly from the folded position?
  3. After salaah, I know it's sunnah to say Astaghfirullah thrice, is it also sunnah to say Allahu akbar once then astaghfirullah thrice?
  4. Is salaah valid if in a 4 rakaats fard salaah, after surah Fatiha of the 3rd rakaah, you say just 'bis' of Tasmiyah before realising you don't read a surah now? If it is valid, what is the maximum length of Tasmiyah which may have been recited mistakenly without invalidating Salaah?

Studying electrical engineering

Q: I would like to study and become and electrical engineer. I live in the UK and working in this field means doing the job in domestic homes, factories, outside work, in offices and business, construction sites etc. Also men and women mixing is unavoidable. There may be a time (whether it's continuous or not) when I have a female client for a home domestic job, or an office company where men and women mix and whose company is something haram or a mix of haram and halal, like insurance or entertainment, restaurant that may sell alcohol. 

My question is: Can I still do this work for clients or provide them my services who may sometimes be women or a business which is haram, as the work may be varied; so one day at someone's home who is a woman or a business whose dealings are either haram or mixed, and another day with men and with a business that is halal for example?  Do I need to be picky? My job would be to just provide them with a service and my intention would be to earn a living. Would my earning be haram in any way?