first the class teaches how to test for pullorum and what it is. you can become certified for $20 but can take the class for free,,I think there may be a chicken health class in the afternoon, also free,,,
next yes you can put chicks under a broody even if she doesn't hatch any of her own, I would do it at night and as soon as the others have hatched as she will be more likely to accept them. Do watch for awhile to make sure she accepts them.
if the egg was dimpled it most likely would not hatch and she could have tossed it out of the nest and an other hen ate it. have not had a hen eat an egg while she was broody but they are self preservationist and will work towards the good of the flock. wich is why they will kill a sick or injured bird
FROM A DUCK
sorry couldn't resist