1- when can I apply for my citizenship? 2-can I go leave usa after I apply? I have trip out side of USA. 3-how long it takes

You may apply for citizenship through the 3 year rule and travel while case is pending.

Best to consult with a family law attorney for guidance.

Working on the VAWA EAD would violate the H1B.

Do I need to attend a Jury Duty in California if I’m still waiting for my AOS approval ?

Contact the court of your status and you should not need to attend.

Yes submitting the N336 with tax clearance appears a reasonable next step.

No as your status is still married, this should not negatively impact the case.

Record retention.

Best to retain a soft copy of your immigration history for at least 5-7 years.

What is the best way to protect myself from being scammed

I agree with my colleagues - do not send money to anyone if you do not trust the situation.

Can I apply for an F1 Visa after marrying an US Citizen?

I agree with my colleagues - best to have an attorney review your case to better assist.

How can I get a different joint sponsor if the current joint sponsor does not have the information required? What do I do?

Best to consult with an attorney for guidance with such RFE and obtaining joint sponsor.