Throwing Knives Help!!

Hello guys. I am making a plugin for a friend with snowballs as throwing knives, and I cant figure out how to set up the snowball to cause more damage, fire, and knockback on contact with another entity. Plz help!!

Code:

package me.OmDalvi.ThrowingKnives;
 
import java.util.ArrayList;
import java.util.List;
import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.Material;
import org.bukkit.enchantments.Enchantment;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.ShapedRecipe;
import org.bukkit.inventory.meta.ItemMeta;
import org.bukkit.plugin.java.JavaPlugin;
 
public class Main extends JavaPlugin {
 
    ItemStack knive = new ItemStack(Material.SNOW_BALL, 16);
       
    @Override
    public void onEnable(){
    //Meta Data   
    ItemMeta kniveMeta = knive.getItemMeta();
    //lore
    List<String> lore = new ArrayList<String>();
    lore.add(ChatColor.GOLD +"This is a disguised throwing knife.");
    lore.add("");
    lore.add(ChatColor.BLUE +"+ ∞ damage");
    kniveMeta.setLore(lore);
    //lore end
    //rename
    kniveMeta.setDisplayName(ChatColor.GOLD +"Throwing Knive");
    //rename ends
    //enchants
    kniveMeta.addEnchant(Enchantment.KNOCKBACK, 100, true);
    kniveMeta.addEnchant(Enchantment.ARROW_FIRE, 25, true);
    kniveMeta.addEnchant(Enchantment.LOOT_BONUS_MOBS, 50, true);
    //enchants end
    knive.setItemMeta(kniveMeta);
    //Meta Data end
    //Recipe
    ShapedRecipe kniveRecipe = new ShapedRecipe(knive);
    kniveRecipe.shape("###","#I#","#S#");
    kniveRecipe.setIngredient('I', Material.IRON_INGOT);
    kniveRecipe.setIngredient('S', Material.STICK);
    //Recipe End
    Bukkit.getServer().addRecipe(kniveRecipe);
   
    }
   
    @Override
    public void onDisable(){
        Bukkit.getServer().clearRecipes();
    }
   
}