Aura's are best seen if you don't worry about them. If you want, download a book on it, or ask around in chatter, even in the articles.
One method is to tell a friend to stand in front of a white/grey wall. Next visualize you seeing a aura. After just stare at the person.
If you see a light, you saw an aura. If not, it's okay. Starting to see this will take time.Good luck, feel free to message me for help.