Here is a very cute video by a very cute girl that explains how to go about curling your hair with a flat iron. You can follow her process and keep in mind that if you want bigger curls all you have to do is use bigger sections of hair.

There are many good videos on the Internet on how to curl your hair with a hair straightener, however I find this method to be the most straightforward, efficient and effective.

This hair curling method is also great for hair mush shorter than the girl on the video. It gives great body to your hair and looks very natural.