How do I make a rig copy my avatar (Client side)

[ocean carbon]

I've tried so many things to make a rig my avatar but it won't worked, all that happend is it copied the latest character's avatar who joined.

[exotic galleon]

local Players = game:GetService("Players")
local userId
local characterModel = Players:CreateHumanoidModelFromDescription(Players:GetHumanoidDescriptionFromUserId(userId))

https://create.roblox.com/docs/reference/engine/classes/Players
https://create.roblox.com/docs/reference/engine/classes/Players#CreateHumanoidModelFromDescription
https://create.roblox.com/docs/reference/engine/classes/Players#GetHumanoidDescriptionFromUserId