How do I rotate this projectile?

My script is as follows...

-- Set Function 

local Rocket = Instance.new('Part') do
    -- Set up the rocket part
    Rocket.Name = 'Rocket'
    Rocket.FormFactor = Enum.FormFactor.Custom --NOTE: This must be done before changing Size
    Rocket.Size = ROCKET_PART_SIZE
    Rocket.Orientation = CFrame.Angles.new(0,0,math.rad(180))

Rocket.CanCollide = false

    -- Add the mesh
    local mesh = Instance.new('SpecialMesh', Rocket)
    mesh.MeshId = MISSILE_MESH_ID
    mesh.Scale = MISSILE_MESH_SCALE

    -- Add a force to counteract gravity
    local bodyForce = Instance.new('BodyForce', Rocket)
    bodyForce.Name = 'Antigravity'
    bodyForce.force = Vector3.new(0, Rocket:GetMass() * GRAVITY_ACCELERATION, 0)

When the script is executed the projectile is fired backwards out of the Rocket Launcher. I know that in order to determine the Rotation I put

Rocket.Orientation = Vector3.new(???,??? * ???, ???) -- This is where I encounter problems.

Thanks for your consideration!

The Bottom Line: How to call rotation functions and how to determine rotation using Vector3.

Thanks

EDIT

Ok SO basically I have added the CFrame to the Projectile, but the mesh itself will not rotate. I cannot figure out how to change it

Here is the script:

    -- Create a clone of Rocket and set its color
        local rocketClone = Rocket:Clone()
        --game.Debris:AddItem(rocketClone, 30)
        rocketClone.BrickColor = player.TeamColor
        rocketClone.Touched:connect(function(hit)
            if hit and hit.Parent and hit.Parent ~= player.Character and hit.Parent ~= tool then
                rocketClone:Destroy()
            end
        end)

        spawn(function()
            wait(30)
            if rocketClone then rocketClone:Destroy() end
        end)        

        -- Position the rocket clone and launch!
        local spawnPosition = (tool.Handle.CFrame * CFrame.new(2, 0, 0)).p
        rocketClone.CFrame = CFrame.new(spawnPosition, target)* CFrame.Angles(0 ,0 ,0) --NOTE: This must be done before assigning Parent
        rocketClone.Velocity = rocketClone.CFrame.lookVector * ROCKET_SPEED --NOTE: This should be done before assigning Parent
        rocketClone.Parent = game.Workspace     

        -- Attach creator tags to the rocket early on
        local creatorTag = Instance.new('ObjectValue', rocketClone)
        creatorTag.Value = player
        creatorTag.Name = 'creator' --NOTE: Must be called 'creator' for website stats
        local iconTag = Instance.new('StringValue', creatorTag)
        iconTag.Value = tool.TextureId
        iconTag.Name = 'icon'

        delay(attackCooldown, function()
            canFire = true