How to make a fly button

-- Local script inside of your button

local speed = 50

repeat wait() until game.Players.LocalPlayer.Character

local button = script.Parent.Parent.FlyButton
local plr = game.Players.LocalPlayer
local char = plr.Character
local hum = char:WaitForChild("Humanoid")
local Torso = char:WaitForChild("HumanoidRootPart")
local Mouse = plr:GetMouse()
local toggle = false

-- function
script.Parent.MouseButton1Click:Connect(function()
    if script.Parent.MouseButton1Click then
        if toggle == false then
            toggle = true
            local Anim = Instance.new("Animation")
            Anim.AnimationId = "rbxassetid://9665206880"-- Animation while flying
            local PlayAnim = hum:LoadAnimation(Anim)
            PlayAnim:Play()
            local BV = Instance.new("BodyVelocity",Torso)
            BV.MaxForce = Vector3.new(math.huge,math.huge,math.huge)
            while toggle == true do
                BV.Velocity = Mouse.Hit.LookVector*speed
                wait()
            end
        end
        if toggle == true then
            toggle = false
            Torso:FindFirstChildOfClass("BodyVelocity"):Destroy()
            local tracks = hum:GetPlayingAnimationTracks()
            for i, stopTracks in pairs(tracks) do
                stopTracks:Stop()
            end
            local Anim = Instance.new("Animation")
            Anim.AnimationId = "rbxassetid://0" -- Animation while idle (I recomend to not change this)
            local PlayAnim = hum:LoadAnimation(Anim)
            PlayAnim:Play()
        end
    end
end)