You should refer to the N600 with direct mailing addresses.

Yes you may attend your interview with expired passport and ID.

What kind of questions should I look forward to during my I-485 interview based on VAWA?

It is best to consult with an attorney for a review for preparation for such an interview.

Refer to the approval receipt for the three letter code for service center that adjudicated.

Which USCIS application center I should send the EAD/AP renewal forms ?

Refer to the form instructions for guidance on mailing addresses.

My wife has daca and used a fake I'd will it stop her?

It is best to consult with an attorney for guidance re: such a matter.

Immigration question-fingerprints

No that alone should not cause deportation.

Can i file fiancee visa even if i am married?

No you must divorce your previous husband in order to file a new petition.

What is the fastest way for my fiancé who lives in a different country and I to get married in the US?

You can apply for a fiancé visa if you can establish a good faith relationship and having met in the last two years. It is best to consult with an...

Why I-864A form is used ?

The co-signer would use form I864. You’re refer to the form instructions for guidance.