can you find a fly shop in your area? they would have the best up to date information. buy some equipment and flies from them in exchange.
if nobody can add some detailed information to your request, there might be more detailed information at a regional forum dedicated to that area. at least do some googling about the the fish you pursue and include the word flyfishing, you'll run into some recommendations for flies and gear.
have you read this or explored this particular forum?:
Millacs/Kathio State Park - Central-South - Minnesota Fly Fishing
by the way, you should find someone or people in your area who can show you in person and help with casting and tying tackle and how to actually approach and read the water. if this is really your first foray into fly, fly shops can take you out on their property and demonstrate or help with casting.
good luck and i'm looking forward to hearing/reading anybody post some of their experiences from that specific area which might help you.