Some good 50s hairstyles are the beehive or the boufant. Both actually have modern day twists that a lot of women use today but if you're going for a 50s look, make them really high.
The easiest 50s hairstyle to get is to put all the hair up in a messy ponytail on the side of the head. Put it up with a bright colored ponytail to create the 50s look.