Once you are married, no matter where, you will have to apply for an FM3 or FM2 as the spouse of a Mexican National. If you are her dependent, financially, it should be fairly easy. If not, you may have to show independent resources from outside of Mexico to support yourself during your two year wait for naturalization, which will require that you are reasonably capable in spoken and written Spanish, etc. Remember, when you marry a Mexican, you marry the entire family; the entire extended family, and they may have certain expectations of you. Proceed cautiously.

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Read "Streets of Glass" to discover the experience of a retired couple's permanent move to Lake Chapala, Jalisco, Mexico.
PM for details.