Lots of good advice above, some worth repeating here....
- If there's an abstract for the land, review it to learn about its history which may or may not raise red flags.
- If off the road or difficult to access, will construction vehicles be able to reach you? Propane delivery if you need it? Septic pumping truck? Especially during inclimate seasons/weather.
-We built our own place in a rural area outside of town and knew the risks of having a very long lane (3/4+mile). Maintenance, gravel replenishment, too soft in the spring, keeping it clear of snow in the winter, etc. For us it's worth it for the privacy but can add some complexity, including what kind of vehicle you drive and type of equipment you end up buying.
-Utilities - Besides water, will the area support a septic and leech field? For power, will the utilities bring in lines? If near a road, probably not that big of a deal, otherwise you'll have to get them to agree, and you'll need to foot the bill. In our area they will only go underground so the expense was significantly more than a few overhead poles.
- To discourage urban sprawl, this area requires a minimum number of acres to be sold as a unit to allow home building. And verify property line setbacks if there's a location you envision the house.
- Easements and Right-of-ways. Even if there are no visible overhead lines or underground utilities, there may still be active easements. If you build a house...or shed...or plant trees that fall on that easement, you may not have recourse for any damage when company X comes along and buys out some long dormant right of way to put up their new high tension lines in your backyard.
- In this state it's illegal to prevent access to a land-locked parcel, and if there's an easement for that owner to use your property to get to his, make sure you've got a damn good lawyer. An annual renewal clause is a must because their property can change hands and the nice old man that stopped out once a month might pass on and leave the land to an unscrupulous family member that uses it as a superhighway.