Gladiolus

I tried posting this once, but I think the forum-monsters ate it, since I didn't see it in the active threads list. Here goes attempt #2...

I'm new to bulbs (corms in this case) and I have a giant bag of glad corms that I think I've wrecked. I'm in southern Michigan; is it too late to plant them? If so, how do I determine if they're viable, and how do I store them for next year?

I managed to get a few tester-glads in the ground, and I have one set of yellow and withered leaves, and nine sets of green leaves without flowers or flower stalks. Am I impatient, or will these not flower this year? Can I encourage them to flower?

Any help is appreciated! Thanks in advance!