Source: Writing Program
R. L. Stine, the writing machine himself, has put together a 16 page book to help writers in grades 3-8. The book steps through the process of getting ideas, setting up scenes & characters, and the most important part of writing, getting over writers block.
Pacing is up to you, started at two times a week going up to being an intensive two week program.
Besides having tons of information, the writing program is absolutely free! Not even an email required.