A ‘blank’ project has no default player character or pawn. Although there is a world and some lighting and a simple floor as I recall there is no functionality. You are simply moving a camera around unattached to any particular actor/character/pawn. If you are just getting started these tutorial may be helpful to you for understanding the basics of creating gameplay elements using UE4.
You also may want to start with the first or third person template as this will give you the bare bones from which to begin experimenting and learning other aspects of the engine.