Generally speaking, a bachelor's degree is sufficient to become an editor, although a master's degree might be helpful. A major in English, journalism, or creative writing are all good degrees to have.
Do you require any previous experience
Being an editor affords you the opportunity to exercise leadership responsibility, a job skill that is portable and will serve you well in other positions. The position also lets you demonstrate your creativity, and if you are good, a few awards and a portfolio of your work will certainly help you advance your career.