Initially based on this mod.

You don't need Ordinator to use this mod—the spells are entirely contained within the mod. You DO need Vokrii and Apocalypse though. Vokrii contains the perk, obviously, and Apocalypse contains the leveled lists that distribute the tomes. This is pretty simple, the ordinator spells will be affected by Sun's Judgment in the same way the vanilla sun spells are.

If you're trying to make an offensive paladin style character I would also recommend Dawnguard Arsenal and the Vokrii - Dawnguard Arsenal patch. Both can be found on the nexus and will give you a lot of offensive options for a Sun's Judgment build. Mysticism also adds some great spells but I feel like the balance between spells becomes really inconsistent when combining mysticism with vokrii. They just don't work very well together, so I'd hold off on that until someone comes up with a more complex consistency patch.

I personally patched my own files to also add the Ordinator spell tomes to the same merchants that Dawnguard Arsenal uses for its sun spells. I didn't want to include these edits in the main files because directly editing vanilla leveled lists would limit the number of people who can use this mod without conflicts. But I think doing it that way is more interesting lore-wise: you get the tomes specifically from Stendarr-worshipping vampire hunters, rather than from any appropriately-leveled source of restoration tomes.

I'm using both distribution methods in my own game since I want this character to be a dedicated paladin and he needs to get those spells as soon as possible. But maybe it makes more sense to make them Dawnguard exclusive spells. I'd upload that plugin right now, except I didn't actually make a separate patch for that, I just added those records to a big, ongoing override file I use for all kinds of stuff. But if someone wants that patch because they don't use Apocalypse or someone finds the Apocalypse distribution isn't working correctly, then I'll make a separate patch for Dawnguard Arsenal.