Good morning everyone

So I've done quite a bit of digging on this and so far the only tutorials and such I've found use the vanilla material IDs for creating customized items (this goes for both creating your own mods as well as using plugins). What I'm trying to do is get more of a cosmetic variety of weapons in my game, i.e. I'd want to have a "Nordic Iron Sword" that looks different from the graphics for the material IDs of "iron_sword" or any of the other four IDs, ideally adding an material/item ID of "nordic_iron_sword" to use. Can anyone point me in the right direction for something like this?