One of the best things you can do for fall grass planting is cover up any bare spots on your lawn. Over the summer, your yard has likely dealt with kids playing, parties, and other outdoor activity. Heavy foot traffic and dry, hot weather can leave bare spots in your lawn, or areas that have exposed dirt without grass.
Take note of all the bare spots of your lawn, and use the fall (which has better growing conditions than summer) to cover these bare spots with grass before winter. These newly seeded patches need deep and thorough (and likely daily) watering. Try to prevent anyone or anything from stepping on the freshly planted seedlings until the grass is at least 3 inches high.