I am trying to find my ancestors and also try to find my origins.?

I am trying to find about my family in dominican republic. My grandmothers grandfather was name Horacio Vasquez. He was president of dominican republic. His wife was name Trinidad Moya Vasquez. My grandmothers mother was name Maria Dolores Ferreira. Maria dolores ferreira's mother was name Casimira Ferreira. Her husband was name Jose Ferreira. Horacio Vasquez died in 1939 i believe. I am just trying to know more about them and who were they're parents. If they came from any other part of the world or something. Does any one know how i can be able to know more in depths of my ancestors and their roots. Please and thank you.