Set either Essential or Protected, flag as Unique, and pick an authorized voice from the VoicesFollowerNeutral formlist.
In the Traits tab, set the race and gender the same as your new character. This will export your character's appearance to your installation folder (the one up from Data that contains the Skyrim.exe). Exit the character creation screen and save your game.
Create your follower's appearance the same way you would create any other character you were going to play.Start Skyrim and either start a new game, or load a game and enter the showracemenu through the console.