Is there any difference when obtaining legal status via marriage to a US citizen vs. a green card holder?

When a US Citizen files for you, you are an Immediate Relative. When a lawful permanent resident files for you, you are a preference relative.

Is the Chapter 2: Marriage and Martial Union for Naturalization for illegal immigrants married to US Citizens?

Finances are always an issue. However, you still might want to consider having an attorney help you. From what it sounds like, your spouse may...

M I eligible to apply for non-immigrant visa to stay with my ill father in USA for 6-12 months?

Certainly sounds like the visitor's visa would be the most appropriate type of visa.

I'm a usa citizen, I petition my step son who now live with us. He causing serious everyday conflicts between my husband and I

If he already has status, you may need to consult a family attorney.

I'm filing my I-485 concurrently with I-130 (USC spouse). I'm on F1 visa and graduating in 1.5 years. Should I file form I-765?

If you are filing for adjustment of status, you may also file for work authorization.

My husband is on H1b and was given a termination notice by his employer as their business is slow.

See an attorney right away. He may possibly be in violation of status at this point.

You would ordinarily be admitted to the US on one visa, not two visas.

My cousin was born in mexico, his dad is usa citizen. his mom is mexican. he lives in mexico. how can he become usa citizen?

If he is not already a US citizen (which needs to analyzed), then the father might be able to file a petition for him. First he would need to...

I have B2 visa can I apply for SSN

No, you would not ordinarily be entitled to one.

What are his chances of staying here in the us. Will getting married help

If he already has an order of deportation, he is in danger of being removed imminently. Talk to an attorney ASAP.