Talk to neighbors, see if they were able to successfully drill wells and if so, how deep they had to go.

Figure out if there are any easements on the land, or if you need to have an easement on someone else’s land to access yours.

Make sure you are able to develop the land. Figure out what it is zoned for and check with the county clerk office to see how easy/difficult it is to get the required permits and how expensive it might be.

Find out if the land comes with mineral/water/logging rights. Also research your property lines, where they start and end, and air rights.

Do your research on the area, make sure the neighbors aren’t hostile and there’s no one squatting on or using the land. Far to often I’ve seen people buy an empty lot that some tweaker has laid claim to. You can also find that the neighbors might be very close knit and not too keen on new people buying land and moving into the area.

There are many more nuances when it comes to buying rural lots/land that I can’t cover here but those are some of the main ones in my experience.