What are the documents for H1 transfer? How many pay slips are needed?

You are to maintain status at all time during your stay in the U.S. Pay stubs are evidence of this.

When to resign from current employer after filing H4?

You can resign after filing and getting the receipt in mail. You may also continue until a decision is made.

What are the exact steps needed to change visa status from B1/B2 visa to F1 visa while staying in US? What is the risk involved?

COS to F-1 may be possible. Talk to an immigration attorney and seek a full consultation of your case.

Best to have the disposition reviewed by an immigration attorney.

B2 rejected once and B1 rejected once. Will it affect my future H1 processing?

Both are unlikely to be denied due to the immigrant intent.

Removal of conditional residence - divorced

The burden is on you to prove that your marriage was bona fide. If he was deployed elsewhere and that is the reason you did not live together, you...

Chance o preference

It is best to talk to an attorney who will review the paperwork and advise.

Status Adjustment (i485):

You are not to do anything except be a little patient and follow up after 30 days if you do not get the transfer notice in mail or you do not hear...

How soon should I apply for F-2 to H-4 COS after my husband's H1B came in effect as of Oct 1? See details.

The application should include your sworn statement explaining your situation. I'm curious why COS for you was not filed along with COS for him?

When H1 is in process - Can I apply for OPT ???

You may seek to extend your F-1 status however COS to H-1B may be denied for this reason.