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Are you doing it yourself? Find out the model but from the picture it's the one we use on film sets and they brew it themselves. I've never been astonished by the coffee but for a single machine that makes a fuck load of it, it's pretty drinkable. I guess I've used the same grind as I do for my technivorm, maybe a bit coarser but steve peel or someone with actual knowledge will be your best bet.
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What kind of grind would I need for it?
Think filter coffee, maybe a tad on the coarse side.
In my experience there's no need to spend a fortune on beans when using these machines.
They make a proper ok coffee and that's about it.
The coffee will likely sit there an hour or two, being kept warm and it also takes the machine a good while to brew (at least our model), so subtle nuances will indeed be "smoothed out".
They're basically percolators, aren't they? At least the ones I've used have a metal basket at top for the grounds, and water & heating element in the bottom; the water boils and is forced up a pipe onto the grounds, and percolates down into the main chamber where it's kept warm until it's served. Usually takes 20 minutes to make an urn IIRC.