I recommend talking to an immigration attorney and see if your spouse is eligible for naturalization and then proceed with the filing.

I recommend consulting with with an immigration attorney in private to see what paperwork needs to be filed.

You can apply from either place. Just make sure you have your documents as well as your fiancée available.

She might be eligible for adjustment of status. Call an immigration attorney to see how to proceed with it.

You need a valid extension letter along with an expired green card to be admitted back. OR you need a valid I-551 stamp.

EB-5 is still an option for such investments.

You will have to continue maintaining your F2 status. Your child will be an US citizen.

I think your question might be best answered by an accountant for tax purposes. For immigration purposes, if you are divorced outside the States,...

It depends on USCIS and how fast the service center may process the request. It may take from few weeks to months. If takes longer, make an...

I agree with my colleague above. You can enter the country on F1 and then withdraw.