How do i make random locations and fade in gui ?

This is actually a cash giver. when it steps on it gets 1000 cash > screen should fade in with black visible GUI so he cant see anything > gets teleported to location also i don't know how to make random locations at once please help me! like i put 5 coords and they can be teleported there by random chance but not randomly anywhere to be stuck

amount = 1000

function onTouched(part)
    local h = part.Parent:findFirstChild("Humanoid")
    if (h~=nil) then
        local thisplr = game.Players:findFirstChild(h.Parent.Name)
        if (thisplr~=nil) then
            local stats = thisplr:findFirstChild("leaderstats")
            if (stats~=nil) then
                local score = stats:findFirstChild("Cash")
                if (score~=nil) then
                    score.Value = score.Value + amount
                end
            end
        end
    end
end

script.Parent.Touched:connect(onTouched)

function onTouched(part)
script.Parent.Blackout.Frame.BackgroundTransparency = 0.9
 wait(0.1)
script.Parent.Blackout.Frame.BackgroundTransparency = 0.8
 wait(0.1)
script.Parent.Blackout.Frame.BackgroundTransparency = 0.7
 wait(0.1)
script.Parent.Blackout.Frame.BackgroundTransparency = 0.6
 wait(0.1)
script.Parent.Blackout.Frame.BackgroundTransparency = 0.5
 wait(0.1)
script.Parent.Blackout.Frame.BackgroundTransparency = 0.4
 wait(0.1)
script.Parent.Blackout.Frame.BackgroundTransparency = 0.3
 wait(0.1)
script.Parent.Blackout.Frame.BackgroundTransparency = 0.2
 wait(0.1)
script.Parent.Blackout.Frame.BackgroundTransparency = 0.1
 wait(0.1)
script.Parent.Blackout.Frame.BackgroundTransparency = 0
 wait(5)
script.Parent.Blackout.Frame.BackgroundTransparency = 0.1
 wait(0.2) 
script.Parent.Blackout.Frame.BackgroundTransparency = 0.2
 wait(0.2) 
script.Parent.Blackout.Frame.BackgroundTransparency = 0.3
 wait(0.2) 
script.Parent.Blackout.Frame.BackgroundTransparency = 0.4
 wait(0.2)
script.Parent.Blackout.Frame.BackgroundTransparency = 0.5
 wait(0.2) 
script.Parent.Blackout.Frame.BackgroundTransparency = 0.6
 wait(0.2)
script.Parent.Blackout.Frame.BackgroundTransparency = 0.7
 wait(0.2) 
script.Parent.Blackout.Frame.BackgroundTransparency = 0.8
 wait(0.2)
script.Parent.Blackout.Frame.BackgroundTransparency = 0.9
 wait(0.2) 
script.Parent.Blackout.Frame.BackgroundTransparency = 1
 end

script.Parent.Touched:connect(onTouched)


function teleportPlayer(pos, torso)


    local char = torso

    char.CFrame = CFrame.new(Vector3.new(pos.x, pos.y + 7, pos.z))

end


function onTouched(part)
    if part.Parent ~= nil then
        local h = part.Parent:findFirstChild("Humanoid")
            if h~=nil then

                teleportPlayer(Vector3.new(460.2, 131.59, -265.4), part.Parent.Torso)
        end         
    end
end

script.Parent.Touched:connect(onTouched)

i don't know how to locate the gui within the script anyone ?.... please ..