Stuck in the 1800's

Dear Members,

I need your assistance to locate records of my ancestors in Zacatecas during the 1800's. I have names from baptismal records and once I've cross into the 1700's I find records on Family Search. Where do I go to receive information of the 1800's?

I'm also hitting a wall once I'm into the late 1600's. I would so appreciate information on how to proceed.

In chilly Colorado,
Carolyn