Registered Dietician/Nurtrionist

Recently, I have been thinking about what career I want to gear towards. I have been going to school online (been out of HS for years) and was trying to figure out what exactly I wanted a degree for. Other than running my own business, here lately, I have been thinking about becoming a registered dietician (in more than one area.) Anyone know how to go about that and to get CADE certified and all that happy stuff? Thanks, Lisa