You've gotten great advice.
Hooking up with a group like Trout Unlimited or a club affiliated with the Federation of Fly Fishers (Tu and FFF each have three affiliated clubs in Indiana). They’re both great groups with informative meetings, group trips, casting clinics, tying classes etc. They could be great to hook up with to meet some new fishing buddies. You can do a search here for FFF clubs:
Locate a Club
and here for TU to see if there is something close to you:
Council/Chapter Search | Trout Unlimited - Conserving coldwater fisheries
As far as where to go, here’s a link to the IN DNR ‘s fishing main page with tons of links, including a where to go fish finder, trout stocking and trout streams, fishing reports etc:
DNR: Fishing Information
I imagine that most of the fishing out your way will be warm water stuff like bass and panfish especially this time of year, in terms of availability but it looks like there’s some opportunities for trout too and some opportunities for steelhead and pacific salmon in water dumping into Lake Michigan (Little Calumet River, Trail Creek, and Salt Creek).
I'm sure folks could give you a lot of suggestions for flies too, but let us know what you'll be chasing and the line weight your rod so they'll be easy to throw.
Good luck and let us know.