Here's a link for some Ohio herp societies if that will help you out.
http://www.herpo.com/societies.html#oh
Mike and I have done a little bit of rescue/rehab but are just trying to help out where we can too and certainly not on a bigger scale. We did decide up front though to know our own limits so we have a rule that we can't handle any hot snakes, any snakes over 8 feet (we have a 5 year old in the house) or take in more creatures than we can realistically help. Not saying you would, but some folks in their zeal to help don't really help because they get overwhelmed by sheer numbers. You might want to speak to a couple of established rescue groups for advice. You can easily get a ton of green iguanas for instance and they are very high need creatures that require large caging for the adults. Networking with other rehabbers is invaluable for placing hard to place species as well as advice and guidance.
Ask your vet if they offer a discount for rehabbers - many do. Make sure your own local laws (state, county, city, etc.) are not going to give you a problem as far as species or numbers. Start saving caresheets on the most likely species you will see so you have access to good information quickly if someone suddenly shows up. Insist that if possible they turn over all housing with the snake/lizard and make them sign a release. I insist on that as I'm not going to spend all that time and effort to have the original owner show up and reclaim their now healthy snake.
I'd say just basically start slow and know right up front you cannot save them all and that is going to break your heart sometimes. When we took Saoirse in (W/C adult female BP who had not eaten in the better part of a year) our agreement with the previous owner was that if we and our vet determined that after trying everything this snake was never going to start eating and was continuing to lose weight (she was only just over 600 grams and a fully adult female), that she would be humanely euthanized. With a lot of careful work and the invaluable advice of Adam Wysocki, and a great herp vet, we turned Saoirse around and she's now a lovely female of about 1,300 grams. She still has some ways to go and will likely always be a bit erratic about eating in captivity but she's found a permanent home with us and is less stressed about a captive existance. The reason I mention her is that we faced up to knowing that we might not be able to save her and dealt with it emotionally before we ever agreed to take her in. Better some of them have a quiet and humane exit than they suffer because a human doesn't know when enough is enough.
Wish you were closer to us in Toledo I'd happily donate some extra feeders to the cause but if you do need good healthy rats to start a feeder colony with please feel free to let me know. You are more than welcome to take a road trip to Toledo and pick out some on the house (you can meet the scaley crew too LOL).
Oh I almost forgot. Something I've yet to do myself but you should get FedEx certified as soon as possible (we have a lovely sticky here on how to do it) as you are going to have to ship live at some point most likely.