Mouse Aim and KeyHolding?

Player = game.Players.LocalPlayer
Character = Player.Character
Humanoid = Character.Humanoid
Mouse = Player:GetMouse()

unEquipScript = script.Parent["Un/Equip Script"]

MagicCircle = script.Parent.MagicCircle.Value
MagicSound = script.Parent.MagicSound.Value
Animations = script.Parent.Animations
  FireSkill1 = Animations.FireSkill1
  FireSkill2 = Animations.FireSkill2
Damage = script.Parent.Damage
  FireQ = Damage.FireQ
  FireE = Damage.FireE

Mouse.KeyDown:connect(function(key)
	if (key == "q") then
		
		local FireQAnim = Humanoid:LoadAnimation(Animations.FireSkill1)
		local Current = FireQAnim
		Current:Play()
		local FireCircle = Instance.new("Part")
		FireCircle.Parent = workspace
		FireCircle.Name = "Fire Magic Circle Tier 1"
		FireCircle.Anchored = true
		FireCircle.CanCollide= false
		FireCircle.Transparency = 1
		FireCircle.Size = Vector3.new(5,5,0.05)
		FireCircle.Position = Character.UpperTorso.Position
		FireCircle.Position = FireCircle.Position + Vector3.new(0,0,0)
		
		local Sound = Instance.new("Sound")
		Sound.Parent = FireCircle
		Sound.SoundId = "rbxassetid://"..MagicSound
		Sound.Pitch = 0.5
		Sound.Volume = 2
		Sound:Play()
		local CircleFront = Instance.new("Decal")
		CircleFront.Parent = FireCircle
		CircleFront.Face = "Front"
		CircleFront.Texture = "rbxassetid://"..MagicCircle
	    local CircleBack = Instance.new("Decal")
		CircleBack.Parent = FireCircle
		CircleBack.Face = "Back"
		CircleBack.Texture = "rbxassetid://"..MagicCircle	
		local LightEmit = Instance.new("PointLight")
		LightEmit.Parent = FireCircle
		LightEmit.Brightness = 50 
		LightEmit.Range = 6
		LightEmit.Color = Color3.new(255, 140, 0)
		FireCircle.Orientation = Character.Head.Orientation
        Character.UpperTorso.Anchored = true
        wait(1)
		Character.UpperTorso.Anchored = false	
        while wait(0.01) do 
	
	
end
		
		end
	
  if (key == "e") then
--	local FireEAnim = Humanoid:LoadAnimation(Animations.FireSkill2)
--	local Current = FireEAnim
--	Current:Play()
	
	
	
	
	
		
end

end)

So I'm trying to make a power or magic for my game in a tool. But Im asking 2 questions, since its kind of hard.

So How do i do mouse over aim(TargetFilter) on changed orientation and key holding?

for key holding. you must hold a bind, if you release it. it will stop or some sort. ty thats all