+3 for Farm Credit entities. I live in Maryland have used Colonial Farm Credit and it's awesome, 25% down minimum, very competitive rates, and since they're owned by the loan holders any profit they have at the end of the year is paid to each loan holder in the form of a credit. Generally this ends up being about 1% drop in the interest rate of your loan on an average year.
There's a lot to know/look into about buying raw land and if you're not educated it's easy to get burned. I would discuss with someone who knows about land development or hire and consultant. It's important to look into a parcels; deeds, easements, zoning, watersheds, wetlands, streams, stream buffers, subdivision regulations, rare threatened or endangered species, forests, soils, percability, septic tier, access to utilities, slopes, viewsheds, etc... I do this for a living in Maryland and it can become extremely complex. I would imagine TN or AL is much more laid back than Maryland.