The beginner level
the first belt in karate is white
the next kaigan karate belt after white is orange
Research has shown that the green belt is 7th belt that can be achieved in Karate. One must achieve each level in karate in order to move up to the next level. Prior to achieving the green belt one would have to earn a blue, then a yellow belt, orange belt, blue belt, purple belt, green with white stripes belt and the next step would be the green belt.
Black belt is the highest. Though traditional Okinawa karate uses a red and white belt to indicate 7th and 8th degree black belt and solid red for 9th and 10th. Many American schools use the red belt as a kyu level below black belt.
The traditional starting point is the white belt. Every style I know starts with white. When you buy a new gi, it typically comes with a white belt.