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Happy to try to help. When we

Happy to try to help. When we talk about a "hill," you want to create a mound of warm, fertile soil that is at least a 3-foot diameter in size. Why a hill? Pumpkins must have very warm soil and the hill takes the soil off the ground.
The soil must also be very rich in organic matter but loose and well plowed, not compact.
In the fall, we would also add composted manure. Further, we like to cover the hills with black plastic to get the soil very warm, at least a week before planting. Make sure the soil is moist but not wet.
We would suggest you contact your New Mexico cooperative extension for more local advice. Here is a good fact page from NMSU: http://aces.nmsu.edu/pubs/_h/H231/welcome.html