You may use either but I would prefer to be consistent with the information on the I-94, Abu Dhabi.

Applying for I-130 application for parents and siblings simultaneously

No, the applications will be adjudicated separately, on the merits and eligibility of each of the beneficiaries

Do I qualify for DACA under 2nd preference? I was 19 when I came to the country in 2009 and lost my status in 2010.

You do not qualify under existing DACA provisions and new DACA proposals are now held up in court so don't help you.

Should I change my job?

You should wait until your I-485 has been pending at least 180 days without adjudication at which time you will be able to transfer to another...

Start business as L1B

You may invest i, or establish, a business. You may not work in the business nor participate actively in it's operation.

Studying in US but had to go to Pakistan to get my 'dependent' F4 visa. I am told I cant travel back before the main beneficiary

Unfortunately there is no other option with the visa that you have. You must enter accompanied by the principal beneficiary, your mother.

If I Marry a Green Card Holder Can I Work in the U.S.?

Not until you get a green card or receive work authorization.

You can find the current priority date for your classification, which is F2A, by checking out the Visa Bulletin at travel.state.gov..

What name to put on the green card application, married or maiden?

That would be your choice but I suggest that you make sure that all of your ID documents have the same name. You should correct those that don't.

It's been a year since I got 2y.Conditional GC, our marriage doesn't work,divorce,will I be able to remove my conditions on GC?

If you divorce, you need to file an I-751 waiver instead of a joint I-751. You will have to prove that the marriage, though broken, was real and...