Is this valid & I can legally stay till 19 Nov 2019 or I need to return back to India before I complete 2555 days (7 yrs)?

Consult with a qualified immigration attorney.

How can I bring my husband best friend and family to nyc on a visitor visa?

Your friends are going to have to establish very strong ties to the DR to be able to secure the visa. (property, good employment, strong familial...

I am a U.S citizen, I'm petitioning for my husband for a green card. But my husband lost his I-94 which is one of his requiremen

Your options are: 1. go to http://www.cbp.gov/travel/international-visitors/i-94-instructions for the records 2. get a duplicate 3. file a FOIA...

What should i do ??

The part of about being sued is not an immigration related question. Talk to an landlord/tenant atty in your state. I am not sure how this impacts...

Whether accept the referring credit would violate my F1 status

Talk to the DSO. Yes it could be seen as a violation depending on several factors.

Talk to the companys immigration lawyers.

If I am on J-1 status and then left the U.S, will I lose it for sure (and need to apply for Visa from an embassy again) or Not ?

It may be faster of you apply in yoyr home country.

I765 fees for green card marriage

You do not need to pay that fee if filed with the I485.

Request for initial evidence confusing !

You need to submit the foreign born birth certificate.

Does 6 years clock reset with new CAP Subject H1B after 14 months Exited US on L1B

Address this with the company's immigration attorney.