director wrote
I have sub-domains for each wiki, but I don't know where to direct them to for a farm.
All sub domains need to point to the same "farmer" aka parent wiki, i.e. your main DokuWiki installation.
director wrote
I have no idea where the farm directories go, what file I edit to tell the program where I put what files
It doesn't really matter where the farm directory is. It only matters that all "animals" aka child wikis are under that directory and that the path in
inc/preload.php ("DOKU_FARMDIR") gets changed to that directory.