Zoned Undeveloped A4 in Dauphin County

[Harri Smith]

Hello
I am trying to find out if one can build a church on a land in Dauphin County, PA, that is zoned undeveloped A4. Where does one start? Realtor is no help to me. If we can't build a church, we want to subdivide the land and build homes for us.  The realtor said there is a well on the property is is shielded by the government. I don't know what that means. It seems little fishy. Assessed at 84K but  they are selling the undeveloped land for 125K.  Also want to find a few builders in the area.Thanks