Stay away from modeling schools, for the most part – they want your money above all else, and tend to turn out "models" who seem to think the runway is everything.
Enroll in a several month long series of dance classes, including ballet, jazz and modern. If they want great posture, great body line and form, and a lot of self-confidence about themselves and how they look to the world, there is nothing like dance classes.
Get in front of a camera weilded by someone who really know what they were doing, especially with light and shadow – never mind the "Uncle Ed" snapshot school of photography.
Avoid paying a lot of money for a "portfolio" before they knew whether the camera actually liked them. I have seen entirely too many expensive portfolios of young men and women that do nothing for them.