How do you make animations work with keys, and how would you add something like a fireball?

How do you make a script, where if you press a key, a fireball appears, how do you position the fireball, and how do you make an animation play, and when it's done then the fireball appears?

• I need help on this, because I have not learned this.

1. i created the OnKeyDown function
2. i create the part i wanted to shoot 3.i added a BodyVelocity 4.i added fire

I did not feel like doing the whole script so there is no damage nor animations ill tell you how to do damage.

--to do damage all you do is 

fireball.Touched:connect(function(hit)
	local hum = hit.Parent:findFirstChild("Humanoid")
	if hum then
		hum:TakeDamage(10)
	end
end)

--here is the script i made

game.Players.PlayerAdded:connect(function()
	mouse = game.Players.LocalPlayer:GetMouse()
	
	function onKeyDown(key) -- key down
		if key == "r" then
			fireball = Instance.new("Part",Workspace) --part i want to shoot
			fireball.Shape = 0
			fireball.BrickColor = BrickColor.new(21)
			fireball.Transparency = 0.5 --change to what you want
			fireball.Size = Vector3.new(4,4,4)
			fireball.CFrame = game.Players.LocalPlayer.Character.Torso.CFrame
			fireball.CFrame = fireball.CFrame *CFrame.new(0,0,-5)
			b = Instance.new("BodyVelocity") -- body velocity
			b.maxForce = Vector3.new(math.huge,math.huge,math.huge)
			b.velocity = game.Players.LocalPlayer.Character.Torso.CFrame.lookVector * 50
			b.Parent = fireball
			f = Instance.new("Fire",fireball) -- fire
			f.Size = 10
		end
	end
	mouse.KeyDown:connect(onKeyDown)
end)