David Vestal's book is a wee bit to complex for the young ones.
After suggesting Henry Horenstein, I'll add that you prepare a simple outline
because you are familiar with them. Set tangilble goals, simplify every process, make each assignment a victory, and let them show you what it is like to be a kid.
What is the single most important, tangible, thing the kids should get from this class ?
I'd suggest that each student should have the pleasure of seeing his/her pictures framed, hanging on a wall at a show.
In 9 weeks, you have very little time. Pretty much you can introduce the subject, have a couple playful exercises, a day or two developing film, and a day or two to have directed play making prints. Remember that kids need play, not because they are immature, because they haven't been screwed up yet...like adults !
Then, you can offer a weekend assignment, twice - because the first time will be a failure for 2/3 of the kids... usually the A students, by the way... and then help them select the images to show.
You should plan to be Socrates in the darkroom, directing each student to make their prints. But you drive the process, taking the burden away. Ask them if they like the print, if this should be darker or lighter... and so on. Lettign them choose between a dark and a light print is probably the best, and proceed that way. Obviously, this takes time.
The warning about doing photography with kids is that what is usually easy for adults can be hard for kids, what is hard for adults is often easy for kids, and that kids are all different. Very often, the kids that are not the 'bright' students are the best natural photographers. This wonderful fact encourages them to work hard when they might not have had great success, and it will encourage anybody who sees the pictures to questin their evaluation methods. Both, as Martha says, Good Things.
I HIGHLY suggest Tri X and Diafine. Good, printable negs are what you want: especially with a world of chaotic technique and unforseen picture conditions.
Finally, have fun... and if you ever use the phrase "Zone System" in this class, wash your mouth out with Rodinal ( 1+50 for 30 seconds, constant agitation ).