How would i make flight tools? (STILL NEED HELP) [closed]

I have script which friend made me but does not work any help? It doesn't show me the tool or anything This is the code

Name = "Fly"
pi = 3.141592653589793238462643383279502884197163993751
a = 0
s = 0
ndist = 13
rs = 0.025
siz = Vector3.new(1, 1, 1)
form = 0
flow = {}
function CFC(P1,P2)
    local Place0 = CFrame.new(P1.CFrame.x,P1.CFrame.y,P1.CFrame.z) 
    local Place1 = P2.Position
    P1.Size = Vector3.new(P1.Size.x,P1.Size.y,(Place0.p - Place1).magnitude) 
    P1.CFrame = CFrame.new((Place0.p + Place1)/2,Place0.p)
end
function checktable(table, parentneeded)
    local i
    local t = {}
    for i = 1, #table do
        if table[i] ~= nil then
            if string.lower(type(table[i])) == "userdata" then
                if parentneeded == true then
                    if table[i].Parent ~= nil then
                        t[#t + 1] = table[i]
                    end
                else
                    t[#t + 1] = table[i]
                end
            end
        end
    end
    return t
end
if script.Parent.Name ~= Name then
User = game:service("Players").Nineza
HB = Instance.new("HopperBin")
HB.Name = Name
HB.Parent = User.StarterGear
script.Parent = HB
User.Character:BreakJoints()
end
speed = 100
script.Parent.Selected:connect(function(mar)
    s = 1
    torso = script.Parent.Parent.Parent.Character.Torso
    LeftShoulder = torso["Left Shoulder"]
    RightShoulder = torso["Right Shoulder"]
    LeftHip = torso["Left Hip"]
    RightHip = torso["Right Hip"]
    human = script.Parent.Parent.Parent.Character.Humanoid
    bv = Instance.new("BodyVelocity")
    bv.maxForce = Vector3.new(0,math.huge,0)
    bv.velocity = Vector3.new(0,0,0)
    bv.Parent = torso
    bg = Instance.new("BodyGyro")
    bg.maxTorque = Vector3.new(0,0,0)
    bg.Parent = torso 
    connection = mar.Button1Down:connect(function()
        a = 1
        bv.maxForce = Vector3.new(math.huge,math.huge,math.huge)
        bg.maxTorque = Vector3.new(900000,900000,900000)
        bg.cframe = CFrame.new(torso.Position,mar.hit.p) * CFrame.fromEulerAnglesXYZ(math.rad(-90),0,0)
        bv.velocity = CFrame.new(torso.Position,mar.hit.p).lookVector * speed
        moveconnect = mar.Move:connect(function()
            bg.maxTorque = Vector3.new(900000,900000,900000)
            bg.cframe = CFrame.new(torso.Position,mar.hit.p) * CFrame.fromEulerAnglesXYZ(math.rad(-90),0,0)
            bv.velocity = CFrame.new(torso.Position,mar.hit.p).lookVector * speed
        end)
        upconnect = mar.Button1Up:connect(function()
            a = 0
            moveconnect:disconnect()
            upconnect:disconnect()
            bv.velocity = Vector3.new(0,0,0)
            bv.maxForce = Vector3.new(0,math.huge,0)
            torso.Velocity = Vector3.new(0,0,0)
            bg.cframe = CFrame.new(torso.Position,torso.Position + Vector3.new(torso.CFrame.lookVector.x,0,torso.CFrame.lookVector.z))
            wait(1)
        end)
    end)
    while s == 1 do
        wait(0.02)
        flow = checktable(flow, true)
        local i
        for i = 1,#flow do
            flow[i].Transparency = flow[i].Transparency + rs
            if flow[i].Transparency >= 1 then flow[i]:remove() end
        end
        if a == 1 then
            flow[#flow + 1] = Instance.new("Part")
            local p = flow[#flow]
            p.formFactor = form
            p.Size = siz
            p.Anchored = true
            p.CanCollide = false
            p.TopSurface = 0
            p.BottomSurface = 0
            if #flow - 1 > 0 then
                local pr = flow[#flow - 1]
                p.Position = torso.Position - torso.Velocity/ndist
                CFC(p, pr)
            else
                p.CFrame = CFrame.new(torso.Position - torso.Velocity/ndist, torso.CFrame.lookVector)
            end
            p.BrickColor = BrickColor.new("Cyan")
            p.Transparency = 0.7
            p.Parent = torso
            local marm = Instance.new("BlockMesh")
            marm.Scale = Vector3.new(1.9, 0.9, 1.725)
            marm.Parent = p
            local amplitude
            local frequency
            amplitude = pi
            desiredAngle = amplitude
            RightShoulder.MaxVelocity = 0.4
            LeftShoulder.MaxVelocity = 0.4
            RightHip.MaxVelocity = pi/10
            LeftHip.MaxVelocity = pi/10
            RightShoulder.DesiredAngle = desiredAngle
            LeftShoulder.DesiredAngle = -desiredAngle
            RightHip.DesiredAngle = 0
            LeftHip.DesiredAngle = 0
        end
    end
end)
script.Parent.Deselected:connect(function()
a = 0
s = 0
bv:remove()
bg:remove()
if connection ~= nil then
connection:disconnect()
end
if moveconnect ~= nil then
moveconnect:disconnect()
end
if upconnect ~= nil then
upconnect:disconnect()
end
while s == 0 do
    wait()
    if #flow > 0 then
        flow = checktable(flow, true)
        local i
        for i = 1,#flow do
            flow[i].Transparency = flow[i].Transparency + rs
            if flow[i].Transparency >= 1 then flow[i]:remove() end
        end
    end
end
end)
while true do
    wait()
    if s == 1 then
        return
    end
end
script:remove()