Should I pursue a Masters degree in English Education or English/American Literature?

Quick synopsis: I graduated several years ago with a BS in Psychology. I recently discovered that my true pion is Literature and Creative Writing. I plan to return to school to obtain a Masters degree in either English Education (7-12) or English/American Literature. My goal at this point is to teach High School English, but I I am also interested in eventually teaching Literature at the College/University level down the line. If I obtain a Masters degree in English Literature or Comparative Literature, will that enable me to teach at both the High School and University level in New York State? I do understand that the more prestigious universities require a PhD, which I may eventually pursue.