I want to go back to the UK for 2 weeks?

Have the automatic extension extended, as you will need a valid passport and valid resident status to return.

What is the fastest way to get green card for married sibling ?

Since you sibling is married best approach is for you to file now and parents file when they are eligible to file. Use the petition that is reached...

In N-400 should I file all trips in past 5 years from the eligible date or filing date?

Since the question asks for trips within the past five years as of the date you are submitting the application it needs to be included.

Yes employment application can and should be filed concurrently with the adjustment application.

How should we answer question 61/62 in part 4 of the I-130 form?

After the petition is filed, it is doubtful you will be permitted to return to the US as a visitor. Consider finking adjustment concurrent wit the...

How long does it take normally for me to receive my travel document ?

Anticipate 2 to 8 months. Processing times are updated on the USCIS website

How to file my H4 and EAD extension together as my husbands H1B got extended till October 2018 ?

With your added info. Yes file the H-4 with EAD. Approval may only be for period of spouseH1b authorization

What to do at the interview?

Filing as single and not listing your spouse will raise questions as to the marriage. Strong evidence of the marriage will be needed. Consider a...

What will be the impact of the new immigration law (effective by August 9) on out of F1 status students?

It is not new law, rather new implementation instructions for existing law. How it will be carried out is the question. Expect strict adherence.

My husband and I want to help sponsor a family member, but we’re very spectacle giving our info, why do we have to do this?

Yes you may be liable for public debt. See form I-864 and instructions