I'm sending .blend files to a new render farm that has dedicated machines that have never run blender before. What machine specs are required, and what software do I need to make sure is present?
(pictures from the blender website) https://www.blender.org/download/requirements/
Since you are running a "Render Farm," you do not need the monitors, mice, or graphics tablets.
I would recommend buying good graphics cards for your nodes, as GPUs seem to increase render speed by quite a lot.
All you need is linux, windows, or MacOS and blender (https://www.blender.org/)