Can I apply to become a US citizen now? or I must wait till September 2017 (or couple of months before) to apply?

You should get a consultation with an immigration attorney for detailed, customized advice. Or, try and help yourself using this website:...

How much evidence of bonafide marriage should you include with naturalization application?

I believe you can find your answer in the link provided: https://www.uscis.gov/sites/default/files/files/form/n-400instr.pdf

Adjustment of status.

The overstay will not matter when a us citizen applies for an immediate relative. The overstay might be "tolled" by the filing of the u-visa,...

Is there a minimum gap required between first & second visit using B1/B2 after having stayed 6 months in the first visit?

You should be ok, but as stated before you might need proof of ties to india. India is famous for immigration fraud so there is always that extra...

You should be fine, but bring residence proof to the interview just in case. You don't want anything to hold you up unnecessarily.

Will a DV case that was dropped without any arrest affect my chances of getting the my Visa Stamped.

It could. Get the certified record from the court and take it to an immigration attorney who handles criminal and immigration cases.

What are the consequences of fraudulent marriage and what defense I might have to keep my LPR status?

Consult with an immigration attorney! You are the poster child for hiring an attorney for any type of government inquisition.

You have such a simple question, aren't you worried you are missing something larger? Hire an immigration attorney to help you.

Does immigration do house visits for individuals going through the AOS/green card process?

You bet. I've had client's who had their homes randomly visited by officers on holy holidays, had neighbors questioned, landlords from 5 years...

My question is how long does it take to receive an answer from immigration services?

Takes about 3-6 months. If your status expires during this time, you won't accrue unlawful presence as long as the extension application is...