LeeAnn has given you some excellent tips. And if you read between the lines, she addresses the issue of patient privacy.
Just as the medical establishment is now primed to protect YOUR privacy (admittedly, sometimes better than others) it will also protect the privacy of others. This means that you can ask all kinds of healthcare professionals to pass along information TO their patients, but you can't get patient names FROM them, unless there is a system already set up for patients to permit that to happen.
So we have to make the most effective use of information technology (which does include the flyers and posters in addition to modern electronic means). One thing to try is to get a local paper to do a story about you and/or what you are trying to achieve.
The Advocacy section of this site has a way to help you find local media outlets you can use: at
http://capwiz.com/uoaa/home/ click on the 'Media Guide' tab at the top right, then enter your zip code - you'll get a list of papers, radio and TV stations, and can click thru to get contact info for their various editors. You can compose a message within that system and send it, if you want, or use the info to make more personal phone calls.
Once you are up and running, we sure hope you will affiliate your group with UOAA, so we can list you on the ASG page and make it possible for others in NE Indiana to find you. See
http://www.uoaa.org/affiliation.shtml for the explanation and forms. And we are working to get these and other tips posted on the site, to make your task easier.
Good luck!
PS - keep us posted ... others here would be interested in knowing what works and what doesn't, AND we can cheer you on from the sidelines too (as Eric would say, send "mad props")