PhD option for a h4 visa Mtech holder(fresher)

I just came to Florida 5 months back after marriage and I completed mY mtech in Renewable energy this year 2014 from India. What is the possibility of taking a PhD here in US and how long it takes in my case.I hold a h4 visa and we will be in US till 2017 end.

I need advice on what are the career options for me… rather than wasting my time and career dreams these 3 years here.