My husband and I just purchased a 3 acre slightly rolling lot. It's prior purpose was farming, so much of it is cornfield. What is the best way to start the process of converting it into a lawn? (ie: rototill, etc.) We won't be building for at least another year or so and I'd like to start the process now so that it will be somewhat "lawn like" when we do eventually build. We live in central Michigan. Thanks for any help!