The manpages for these commands are a bit cryptic, but the setfacl man page has examples on the bottom. Try these commands out yourself. You may need to add "acl" to the mount options in /etc/facl if it isn't already used. You can mount it with the "acl,remount" options to add the acl options to an already mounted partition. You don't need all the options when remounting. E.G. "sudo mount /home -o acl,remount"
One thing that I didn't realize at first is with using default acls:
Suppose you want the group ftpusers to have rwx access on a directory and inherited on new directories inside:
sudo setfacl -m g:ftpusers:directory
sudo setfacl -m d:g:ftpusers:directory
You need to set the acl for the group, as well as the default acl. The directory itself won't be changed otherwise.