script for a noob

local plr = game.Players.LocalPlayer
chr = plr.Character
torso = chr.Torso
mouse = plr:GetMouse()

local part = Instance.new("Part",chr)
part.Transparency = 1
part.Anchored = true
part.CanCollide = true
part.FormFactor = Enum.FormFactor.Custom
part.Size = Vector3.new(10,.2,10)
local pe = Instance.new("ParticleEmitter",part)
pe.Color = ColorSequence.new(Color3.new(0,0,0),Color3.new(1,1,1))
pe.Size = NumberSequence.new(.1)
pe.Texture = "http://www.roblox.com/asset/?id=241685484"
pe.Transparency = NumberSequence.new(.25)
pe.LockedToPart = true
pe.Lifetime = NumberRange.new(50)
pe.Rate = 10000
pe.Speed = NumberRange.new(0)
part.Parent = workspace
int = -3.1

mouse.KeyDown:connect(function(key)
    if key == 'q' then
        int = -3.4
    elseif key == 'e' then
        int = -2.7
    end
end)

mouse.KeyUp:connect(function(key)
    if key == 'q' or key == 'e' then
        int = -3.1
    end
end)

while game:GetService('RunService').RenderStepped:wait() do
    part.CFrame = torso.CFrame + Vector3.new(0,int,0)
    part.Rotation = Vector3.new(-180, -0, -180)
end