Info on a breeder - well.. 1st of all, if you get a name of the breeder, check them on the internet - search their names, search their Kennel names - you never know what you might come up with -
Stay away from Back Yard Breeders - how can you tell? if possible go to the breeders home and see the condition, are the Sire and Dame onsite?
Dont fall for the 'They are registered AKC' and purebreed etc. ALOT of 'unhealthy' dogs come with papers - go to dog shows in your area, contact your local Kennel Club, they will now people who know people etc. Check with your local Vet, they might be able to recommend either a Club or a Breeder.
You do not want to buy over the internet if possible - its best to see the conditions yourself - try to stay away from "Middle Men" puppy brokers, that bring the puppies in from 'Who knows where' and sometime brought in from "overseas".
Recommendations 'Which breeder do you use? would you purchase another puppy through them? what type of health issues have they had? (if they say NO health issues, I'd be very suspect) and asking on sites like this too!
I went to the BCARN site (The Bulldog Club of America Rescue Network) (Google BCARN for the exact site address) and they actually list 2 dogs in IA - that are in the 'Illinois English Bulldog Rescue' - so its safe to say you would fall into their area