Superhot/Genji type shuriken

and

how do I make something like these? (I think I know how to throw objects but I don't know how to make a shuriken "system") Obviously I would have to make the animations but how would I have an object as a thing my player is holding that it can throw, then have an (x) seconds of cooldown before it throws again?


Thanks

 

It's pretty much what it looks like: move a projectile object through space, check for colliders, or else check for proximity to things you can hit.