Pricing/copyright/models

[Riod]

I may have the opportunity to provide photographs of martial arts activity to a person that is writing a book on the subject.

I want to protect my interests in the images that I produce and I also want to price my work realistically. There will be several people shown in the images and most of the images will be of recognizable people.

How do I handle the model release forms, how do I price my images and how do I keep my images from being reproduced all over the place.

Thanks,

Lynn