Fastest way to bring wife of USC into the USA legally

You will file an I-130 petition sponsoring you wife. The USCIS website is a good resource but, incomplete. For a complete review of your options...

Can I add dependent on my approved I-797 at the consulate, when the petition had me as unmarried?

You don't actually add a dependent to the I-797. Your dependent is eligible for the H4 visa because you have an H1B visa.

B1 or or B2 to E-2 (based on investment)?

B1 visitors are routinely admitted for 6 months. B1 admissions are generally for the business purpose of the trip. Neither permit an intent to...

How long before I can re-enter usa if we cancel our visa (CR1) application & could I enter as long as I qualify for Visa Waiver?

Consular processing is taking about 6 months. An ESTA admission might be granted.

Any way to get my fiancee here with me if I don't make enough money for sponsor?

if you don't make enough money to sponsor your fiancee or spouse you may find someone (parents, friends?) to act as co-sponsors.

Do we have enough time for getting advance parole by August?

An advance parole travel document is currently taking about 90-100 assuming your biometrics is timely.

Can I change my status from case from H1B to B1, incase I get laid off from my work ?

You might file a change of status to B. We have seen some approvals. But, note although immediately out of status you are in a period of authorized...

Selected as the best answer

A) Can I reactivate my H1 later,after working on H4 EAD?Till when(cap exempt)? b)Can a new employer file my h1b reactivation?

A new employer may file an H1B cap exempt petition on your behalf.

Do I need to replace a Green Card with no expiration date?

Customs and Border Patrol says: Green cards issued between 1979 and August 1989 do not have expiration dates and do not need to be renewed unless...

Interview of I-751

it may not mean it is automatically denied. It seems it likely means additional evidence the marriage was in good faith must overcome the letter.