I have received a letter to file for permanent residency( petition to remove conditions on residence)

Everything that is stated on the form instructions. Such as proof of bonafies, two affidavits etc...

Does a marriage (with subsequent divorce) disqualify someone from CSPA Section 6 eligibility?

You really should consult with a lawyer. Your fact pattern has many twists.

Does the fee for the I-817 include the work permit or do I also have to pay the $380 for the work permit?

You always pay for the permit, read the form instructions.

My priority date is April 12, 2001 but I got my approval until 2006 so do I go by unmarried child under 21 because I was 18 year

The formula is complicated and you should see a lawyer but you take your age now and subtract the time it took to get the I-130 approved.

Can i apply EAD extension of my husband based on my I94

If he wants to work, yes.

B1 Visa to a student visa

overstay disqualifies you. So no.

How long do I have to wait In case I would to get divorce and maybe want to marry someone else and he may not be an American

If you do that, you may be questioned abiut the citizenship since the marriage according to you is not viable an longer.

Is there a suggestion how to apply for SSN without the passport (?

Work permit is enough for I-94. Go back and talk with a supervisor.

Is it possible to cancel a previously submitted affidavit of support if the conditional green card has not been issued yet?

Possible.

Selected as the best answer

How can I fix my husband? How much is the cost?

The place to start is at a law office during a consultation with you and your husband. He/she would need all facts to discuss options.