Lawnmaker, our recomendations would be to start with a soil test to make sure you have proper soil pH, and then go from there.  Healthy grass grows in healthy soil and to make sure the soil is healthy, a soil test is a great start.  You'll find out if you need to apply any fertilizer, Lime, Sulfur or organic matter.  Then you are half way to your lush, green lawn.  Once you know what your soil needs, then you'll need to add new seed to get your grass or turf started.  Good luck with your project!