wow!
To answer number 1: unless you are teaching at the university level or at a private school such as Carol Morgan, the salary will probably not be equivalent to the same job as a certified teacher in NY.
To answer number 2: Depending on your age and ability, I would say about three years to really get it.
To answer number 3: What are your motives for moving? Is life in NY unbearable? Look inside your life my fried.
Whatever is bugging you might go with you to the DR!