Q.Grass Seeding
My home is built on two acres of land that used to be a cornfield. Two years ago when I built my home, I did not till under and level out the two acres as a lawn. I am now ready to attempt to do this. I live in southern Georgia and have been told that Centipede grass would grow very well in my area. My questions are: If I till under the weed and wild Bermuda grass combination that is currently growing in my yard and throw out Centipede grass seeds, will I have the Centipede lawn that I want, or will it be a mixture of wild Bermuda, Centipede, and weeds? Do I need to spray something to kill the currently growing weeds and wild Bermuda grass before I till it under? If so, what? Also, about how many pounds of Centipede seeds will it take to spread over two acres of land?

Certified GKH Gardening Expert
It will most likely be a mixture. It would be best to treat the area after tilling with Roundup 2-3 weeks before planting the seed. This article will help you with the amount you need:
https://www.gardeningknowhow.com/lawn-care/specific/centipede-grass/centipede-grass-care-planting.htm