Need help with projectile damage

[spankingorphans]

so i want to add a custom amount of damage, like i want the fireball to do 100 damage but i dont know how to add it

Quote

command /firewand:
    permission: fb.st
    aliases: /fb
    trigger:
        give player 1 fire charge named "&4&lFireball"
on right click:
    if player's tool is fire charge named "&4&lFireball":
        spawn fireball above player
        push last spawned entity in direction of player with force 2

 

[spankingorphans]

and if anyone else can make it so the fireball that gets shot doesnt break blocks on hiy? if so thank you