The simplest manner in which you can style long hair is with long ponytail hairstyles. It is easy and looks very nice as well. With just some modifications you can have a serious office look or a casual party look as well.
To make you hair look even longer, you can try the fake long ponytail hairstyle, which involves dividing the hair in two sections, a low pony and a high pony overlapping it. Another style is where you middle part your hair and tie a low ponytail and curl the stray strands to frame your face. Side swept bangs also look good with long ponytail hairstyles.