how to get into law school in nyu ?

You need your A levels and SAT to apply to US universities as an undergrad to earn your Bachelor degree. You need a four year Bachelor degree and take the LSAT exam to apply to Law schools, which is another three years.

You would study US law. You would not be able to get a job in the US as a lawyer- the field is saturated. A degree in US law wouldn't do you much good in another country.

You need to apply, be accepted, prove you can pay, then apply for a student visa.

In the US, law is a post-graduate program only. You can't study law/to be a lawyer for your bachelors degree. You must get a bachelors degree first, in another subject, and then apply to law school.