Help with custom sword slash attack

Hello everyone!

This is my first post here, so sorry for any mistakes on my part.

I'm a very new developer — I started making my first Fabric mod now in 2025. I've been following the Kaupenjoe tutorial series for Minecraft version 1.21.X.

In my mod, I made a custom 3D sword called Excalibur, and I really want it to have a special right-click ability: launching a sword slash (basically like the Excalibur attack from the Fate anime series).

I suppose I’ll need to use GeckoLib to do a custom player animation for the slash movement — and that already seems pretty difficult — but I also want the sword itself to have a first-person animation. And then there's the whole part of creating the projectile...

So to sum it up:

• I want to animate the player model doing the attack,
• animate the first-person sword movement
• create a cool slash effect/projectile that gets released when right-clicking with Excalibur in-hand.
• Later on, I’d like to add a cooldown to the attack as well.

Unfortunately, I don’t really know how to do any of that yet 😅
But I have time and patience — so if anyone has tips or guidance, I’d be super grateful!

Also, sorry for any grammar mistakes — English is not my first language.

Thanks in advance!