We have vocational farming offered in high school and as a university dergree. But neither is required, nor any license. And generally real estate taxes are lower on farmland than on residential or commercial property (an exception being a residence actually on the farm and the option is available to claim homestead exemption which is cheaper still) No other taxes are levied as such.
I have 73 acres in Mississippi with mixed timber and farmland with 2 farm ponds. Currently in pasture with cattle. The last actual cash crop having been watermelons. Total property taxes were a bit over $200 (127 pounds) last year. What I do on it is not regulated in any way.
I envy you your freedom - God's Own Country