Assess yourself from the prospective of your future employer. Would you prefer to hire an individual who has an established positive online brand or an individual who seems to have no online presence, or worse, a negative online presence? Determine how you will brand yourself. In many instances, you may simply decide to use your name. However, if you have a common name you might need to differentiate yourself. If you already have an online presence, take a good hard look at it as though you were a potential employer. Are you comfortable with what comes up when you search your name? Now would be a good time to clean up your profiles.