H1B Stamping-Married to US Citizen

Hi everyone. I am getting married to a US Citizen in April 2017 and I am planning to visit India right after the wedding. I also plan to get my H1B visa stamped during this time. I have following three questions.

Should I indicate that I am married to US Citizen in DS 160 eventhough at this point we are just engaged? If I indicate single at this time, can I update it later before the interview?

I am eligible for visa interview waiver, should I opt for Visa interview considering that I am married to US citizen at that time?

The current plan is to stay in US in the immediate future, Is there anything I should add has documentation for the visa interview or Visa drop box?

Did you get through interview? Did you find any problem? I am in the same boat.