What can I do in this "F-1 Administrative processing" situation?

You need to follow up with the consulate.

Advice

You do not need to apply for B status extension as you filed for adjustment of status.

I came here in 2002, I was 10 years old. I got Daca in 2012. I just for married to a permanent resident. I have a question?

You cannot get a green card without a waiver if your spouse is a green card holder.

Shoplifting and I-751 remove conditions, will I have problems?

You need to take court documents and show them to an attorney. Different states have different possible results.

You should discuss this with your lawyer. Likely, you simply have to wait.

I can obtain U.S citizenship from my step-mother?

You need to verify your eligibility on uscis.gov website. Also, you can consult with an attorney in person or Skype, or over the phone. No lawyer,...

My company is filing for my 140 (EB2) category. Can I pursue MBA outside US, and come back and still use the 140?

It is possible. You are not required to be present in the US.

After an interview of marriage based greencard

You have to follow up; try complaining to the ombudsman.

How should I proceed with my fiance's visa to move to the US and get a greencard?

You should speak with an attorney. It all depends on your plans.

My question is would they make interview of us together and how long does it take for them to schuele an interview?

Family members can be interview together, or can be interview separately, since you are not each other's dependents.