You're not far from the Perfect Game showcases, etc. in Iowa. You might check them out. We are in Wisconsin too - northcentral - and my son attended a Wis. showcase in Appleton in June run by Showtime sports (http://www.showtimesportscamps.com). There were a lot of college coaches from all over the Midwest there. They have tryouts in the spring at different sites around the state.
One other thing that we did that also brought attention is to attend the Pro tryout camps. I was surprised how much attention that brought and also gives you a pro scout who has seen you - you'll need that on the college questionnaires.
I also really believe that working hard in high school baseball matters. My son played at State as a soph and that started the process for us. He plays football and basketball too so we didn't use fall leagues or fall/winter showcases. BUt, others do and it works too.
Good luck!