You don't need a Dominican lawyer for this. U. S. immigration matters are governed by U.S. immigration law not by Dominican law. A Dominican lawyer does not know and cannot practice U.S. immigration law. All he would be able to do would be to act as a very expensive facilitator. I would suggest, therefore, that if you require a lawyer, you should look for an American one.
I know I should not be posting this comment. I am a Dominican lawyer, and like lawyers everywhere, I am supposed to act my normal greedy, despicable and dishonest self. It must be the time of the day.