How do you gain wizard powers

They will not be like casting spells and all that. Powers are just inhuman psychic or emotional attachments to your element (earth, water, fire, air, rarely: light and dark). If you did develop 'powers' they will be slight changes in the mind, abilities that allow you to connect with "your element" (which in books of palm reading you can figure out which element you are). There are other ways to develop slight inhuman power mutations, such as I am an earth elemental being and I follow rituals to get me emotionally attached to my element. See the related question, further down this page, listed under Related Questions.