Number one thing to consider about land before price is zoning! Do your research our as they say in real estate "due diligence." Zoning effects what the land can be used. Also the square footage of the property, number of stories, yard space (front rear side), even if you can put a detached garage is effect too.
1.Consult an architect and see if the land meets your current and future needs.
If you ever need to expand the size of your property
(e.g. If your family grows or if you have more money available)
2. Seek financing for the land and for future construction needs.
3. Se what have sold recently and in the past and compare to what on the market.
You do not what to pay for something that is over priced on unless it is some thing that you ca not do without.
Finally good luck!