We have used a lot of resources - our NRCS biologists and field staff have helped a lot, as well as advice from the seed company.
This document is a great resource - NRCS Michigan Biology Technical Note NO. 20 (April 2013) - Pollinator Biology and Habitat.
Also, the Xerces Society (www.xerces.org) Pollinator Meadow Upper Midwest Installation Guide and Checklist