Natural Wildlife Friendly Backyard Ideas?

We’re moving to the country and we don’t have a lot of land, but some. We want to attract and maintain a natural wildlife friendly backyard. We’ve considered a bat house, hummingbird feeder, squirrel feeders, bird feeders, and maybe even a purple martin house. We live in Central Missouri. Any ideas on what else we may be able to successfully maintain? Or just awesome ideas for our new backyard and garden?
- Roni Ann