On your journey to the underworld you can end up in three different underworlds which are Helheim, Valhalla, or Folkvang.
Helheim is described as the home of the goddess Hel, Valhalla is said to be the hall of the fallen which could be the place where you would go if you weren't a "good person, and lastly is Folkvang meaning field of the people".
In order to prevent the dead coming back to haunt the living, the vikings would cut off the dead person's head or drive a wooden stake through the body