Download EllesmereUI.
Free, and three ways to get it.

Pick whichever suits you. The addon is identical either way

Then what?
Three steps and you are playing.

  1. Install it. An addon manager handles this for you. Installing by hand means dropping the folders into World of Warcraft/_retail_/Interface/AddOns.
  2. Log in. EllesmereUI sets itself up on first launch. There is no configuration marathon waiting for you.
  3. Pick a preset. Open the options panel, choose a community layout, and you are done. Or move everything yourself with Unlock Mode.
Browse presets Watch a setup guide