Rake up all rocks and break up large clumps of soil with a hoe, and then work them into the rest of the soil.
Remove all the weeds from the ground to prevent weeds from outperforming your grass seed. Use an herbicide to kill a large number of weeds, but avoid planting grass for two to three months after the herbicide application.
Add a 2- to 3-inch layer of organic material such as compost or manure to the top of the soil. Work the compost into the soil to a depth of 6 to 8 inches; doing so improves aeration and the richness of the soil.