Learn the basics and cast spells. Without the basics there is nothing to accomplish. You cannot summon psi balls, you should pratice it. Hold your hands like you're holding a cup or ball and visualise energy ball in your hands. Do it perfectly and you'll succed. Concentration and will is important.
Auras can be seen through the eye. Place a friend in a white wall and watch his head. Watch closely the white energy been seen around his head. Then pratice and pratice.