Well, it all depends on the length and cut of your hair already. Now if it's long and straight you can always go with the straight down parted in the middle style or you can always use a 1/3 in barrel curling iron.
Try something simple first like changing your part. You can do one down the middle or a side part. A clean or messy pony tail can be pretty as well. Try wearing your hair half up and half down in a half pony tail. A simple headband is also a good way to keep your hair back.
pony tail, straight back combed, Braided up, tied in a scarf, wrapped around, curt short, it really also depends on the look you are going for, but i just wear my down