In either case, they felt a need to take the law into their own hands. In addition, they require a license to opperate legally. Needless to say, they do not feel a strong sense of loyalty to the government. Dragon riders are hired by the government or they just do it for fun. When a dragon is sighted over the city, the fly out on gliders to catch them and ride them away from the city.
Wizards are the most straightforward type of majician.
They cast basic spells by means of incantations and hand gestures. Witches use ingredients such as herbs and chemicals to cas their spells. Clerics cast spells by means of faith in a god.