how would i replace a characters appearance with models? (if you can)

##so i got some models for the players appearance but i dont know how to make it so the player switches to the appearance.

server

function onPlayerRespawned(newPlayer)
	while true do
		if newPlayer.Character ~= nil then break end
		wait(.5)
	end

-- what do i do here?

end

function onPlayerEntered(newPlayer)
	newPlayer.Changed:connect(function (property)
		if (property == "Character") then
			onPlayerRespawned(newPlayer)
		end
	end)
end

game.Players.PlayerAdded:connect(onPlayerEntered)