How do I make a part follow the back of character?

(This is what I have so far, and I know that it is inaccurate.) How do I make the part (asd) float about behind my character?

local run = game:GetService("RunService")
local cam = game.Workspace.CurrentCamera
local player = game.Players.LocalPlayer
local character = player.Character
local CameraPart = game.Workspace.asd



if not character or not character.Parent then
    character = player.CharacterAdded:wait()
end


while run.RenderStepped:wait() do

CameraPart.CFrame = game.Players.LocalPlayer.Character.HumanoidRootPart.CFrame.lookVector + Vector3.new(0,7,10)
cam.CameraSubject = CameraPart
--cam.CFrame = game.Workspace.asd.CFrame
cam.Focus = game.Players.LocalPlayer.Character.HumanoidRootPart.CFrame
print(CameraPart.Position)

end