to "benefits" I would add:
- produce great material to compost
- eat kitchen scraps (as snacks not full diet)
- very entertaining pets
you might however ought to mention some of the, how would you want to put it, "other facets of" keeping chickens, as well:
- need to have someone check on them daily when you're away,
- if you accidentally get a roo you will have to find something to do with it,
- they are not entirely silent, not even the hens,
- they are not entirely odor-free unless kept scrupulously cleaned,
- if you let them roam your yard/garden, they WILL eat garden plants and scratch dusting holes in your lawn.
(People need to be able to form a realistic, informed idea of whether chickens are "for them").
It would be real useful to add a short section, or at *least* a good handout, on what are the normal behaviors and body signs of a healthy chicken, and what things are apt to indicate problems.
Also an overview of typical daily, weekly, monthly, yearly maintenance would also be a good idea (such as: daily: collect eggs, check water and food, refill as needed; remove poo from droppings board; say hi to chickens and make sure they're basically ok)
Plus, people who take the class will need more info on coop design, e.g. space per chicken (including pros and cons of larger and smaller coops), roost design/space/materials/height, nest box design/location, locate a pop-hole door 8" or so ABOVE floor of coop, slope roof so it drains rainwater AWAY from run and doors, etc. In fact they may need this info just to be able to decide whether they do want to try chickens at all.
Good luck,
Pat