there are lots of schools offering a combined MS/PhD or individual MS or PhD programs. decide what you like i mean research type and apply to that school. there will be universities near to you so try those first and them go for the farthest once. to get into these programs is difficult because you need a good gre score and toefl too. if there is a school who accepts your nbde score then you are in luck. but do go through all the schools available call them talk to them and then apply.