Hello Customer (name blocked for privacy) and welcome to JustAnswer!
If you know the value of your land it is really not too difficult to determine whether to sell or lease. Say your land is valued at $5,000/acre and they want to buy 2 acres, all you get is $10,000 and that's it. On the other hand, say they offer $500/month. With monthly lease you will make $6,000 every year depending on the contract which is at least 10 years and that means you get $60,000 or higher!
So my suggestion is leasing is always better in the rural area (as long as you don't have an emergency and need money now) but you will have to nagotiate the right price. Usually monthly leases depending on the area and size of the land is between $750 and $1500.
If you want to read some Question/Answers and real life examples go here:
http://www.privateline.com/Cellbasics/leasinginfo.htm
If you want a proffesional to help you with nagotiating and the other procedures you may check this:
http://www.steelintheair.com/index.html
Hope this helps and let me know if I can help further.
Have a great day!
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