A massive website on all things permaculture. The image link opens to the RMH resource section. However, there is far more info throughout their dynamic rocket discussion boards with some of the best "rocket stove scientists" contributing regularly. You can put your own questions and comments on it to get some excellent advice and discussions.
French permaculture website offers classes in building these systems. The image link goes directly to the rocket stove section within the site. To go directly to video showing a beginning-to-end class: