If your spanish is decent, just go to any country in south america and find a farmer/owner. Farms aplenty out of every major metro about 1-2 hours from the metro, in every direction. A quick google will help you find the regions in every country where coffee is grown, or maybe even google maps.

They will gladly talk to you for hours and show you the ropes. If they like you they will give you carte blanche to come in to the property unannounced and speak to their employees, anytime.

Because in the end, its possible you buy their plants or seeds, and many farmers make money from that too.