Will I need an attorney to file for a fiancé visa?

Without knowing all the facts and circumstances it is impossible to properly advise you. I recommend that you have a consultation with an...

I have had clients enter with their I-751 receipt notice, their expired green card and their passport without any problems.

Case pending after adjustment of status interview?

In my jurisdiction this is a very typical interview where there are no issues in the case and the evidence demonstrates that it is a bona fide...

H!B Stamping a month before expiration

Yes if you have an extension approved and want the new visa in your passport - the consulate will process a visa up to 60 days before it becomes...

Immigration

Only after an attorney reviews all of the facts of your case can that question be answered. I presume your current attorney has already done that...

I have never heard of "advisory" approval. The process of converting an I-140 is very simple. Your employer files the premium processing form...

Marriage to a Green Card Holder / USC

I agree with my colleague. No need to file a new I-130 - it will be upgraded when your provide the appropriate evidence of naturalization.

Can i work while my H1B extension in process and my i94 expires?

If your H-1B visa is filed prior to the expiration date of your current H-1B visa and you are eligible for an extension, you can continue to work...

Will moving to a new address within the USA impact a permanent residency petition?

It should have no effect on your husband's application for permanent residency as long as you notify USCIS of your new address.

Can I use parent's address on N-400 application, since I moved to another state temporarily as part of my student rotation ?

Yes, if that is your residence you can use that address. But your interview will be held at the district office that has jurisdiction over that...