Marrying a US citizen whose previous spouse was deported?

Yes, if you two plan to get married within 2 years of her prior marriage, CIS will look closely at your relationship ... and YOUR immigration history.

Can H4 beneficiary stay in the country on H4 legal status for court proceedings until divorce decree is received?

Yes, you can stay until the decree is final ... and then leave IMMEDIATELY.

Decision after RFE?

CIS is running slow. I doubt that they will respond in 15 days ... go ahead and contact them.

My 3rd OVI in NW OH. 1-2007 2- 2016 and this 1. Can’t afford good attorney. What am I looking at.

OVI? Operating a Vehicle while Intoxicated? If so, this is not an immigration question.

F2B RFE

Hire a lawyer. CIS has been granting additional time to respond to RFEs.

How long does it take to get a biometric appointment after receiving the notice of action ?

Biometrics are taking longer than usual. Sure you can inquire ... but, be ready for them tell you to be patient.

Expungments have no value ... you must provide CIS with certified copies of all police/court records. Work with an attorney.

Do not 2nd guess your DSO. Follow his/her instructions. Only he/she can do the data fix.

Can i leave USA wile provation?

It appares that you have a criminal conviction. Talk to your criminal defense attorney.

Yes you can hire a lawyer to file your I-485 ... at your expense.