How soon can I have my Turkish fiancee come to the USA and how?

You did not provide all necessary information to answer your question. If all the factors are in place, with a fiance petition he could be in the...

What is the reason for this interview ?

Since no one here knows anything about your case and hasn't seen the paperwork, no one can answer this question. IT could be a serious concern; it...

I have being visiting usa since 2014 with b1/b2 visa and i met a lady, we are getting married, is it ok?

Maybe. Maybe not. More information is needed. Speak with a lawyer BEFORE getting married.

What happens when a wife do domestic violence repeatedly on Husband and hide his Green card & other documents ?

The husband should speak with an immigration lawyer to discuss his options.

How much time does it take for work authorization and travel document after the approval of prima facie?

It depends on whether you filed the proper documents to get a work authorization and on other factors.

The cop will likely say he smelled marijuana, which entitles him to search the car. Rolling papers are considered drug paraphernalia if they are...

Can we apply 130 abroad

Yes. He can live abroad while the i130 is pending but there are requirements he must satisfy and living abroad may complicate that. You should...

Can I re-enter the USA on my Green card after being outside the country for 5 years?

You shouldn’t apply for anything until you talk to a lawyer.

Can I get a felony possession charge expunged even though I used my conditional discharge?

Based on the facts you provided, it seems you can expunge the felony, if enough time has passed.

Who is considered as principal applicant?

Your questions shows you do not understand the most basic part of the application. It only gets more difficult. Hire a lawyer.