Is there any document need to be obtained for someone who didnt work in the US and applying for N400?

Yes indicate accordingly and provide an explanation of the reason for no filing.

How to correct my i94 details ?

I agree with my colleague - a walk-in to your local CBP office for a request for an updated I94 is best.

Can I have different lawyer at the individual hearing with previous master hearing in immigration court? (immigration )

You may do so but this may delay your court case.

I-130 petition for parents

Yes you must submit secondary evidence if the certificates are not available.

Hello can I bring my wife if cr1 visa get denied?

More information is needed about the basis for the denial to determine if she may enter on another visa.

What type of visa should I apply for my wife?

You can apply now as a LPR or get your citizenship and do so then, which will be less time. Either scenario would work. Best to consult with an...

These delays unfortunately happen very often. You may want to consider an infopass appointment, if you can schedule one, to inquire further.

If an applicant fails the civics portion, how soon can they reapply to retake the test? Is there any fee for the second time??

You will need to reapply with current N400 fee and can do so at any time.

I864 form part 2a?

You should indicate either the physical or mailing address of applicant.

Was my marriage legal if he was married in his home country when we married

No this subsequent marriage would not be valid.