What comes with the machine? Does it include any discs? The pump and hosing? Anything else needed besides the discs?

The grinder does not come with any disks as different processes would require different routines in diamond disks so it's difficult to make a "one size fits all" disk routine. The grinder would need disks, a way to get water to the grinder (either a tubing kits with hose pipe connector: https://www.hisglassworks.com/6-foot-1-4-inch-tubing-kit-push-connect-adaptor-and-hose-adaptor-html.html, or a submersible pump: https://www.hisglassworks.com/submersible-pump-for-grinders-and-core-drills.html).