a good site..some of the best hang out here
http://www.lawncafe.com/forumindex.php?
http://www.lawncafe.com/forumdisplay.php?f=53
bohawk gave you the best advise..
should be a neighbor who has figured out the soil conditions and made the proper steps from that starting point.
you can take a soil sample to your nearest testing agency.
there should be a city or state supported agency for any and all questions you may have from soil, grass to shrubs,trees and any and all plants.
believe it or not the Scotts Co. actually has some qualified folks on the 1-800 # as well..also once you establish a heathy lawn they have a program that is set up for each and every section of the country.
http://www.scotts.com/smg/
another thing you can do is keep an eye open for the rep in your area from ChemLawn or any of those national co.'s
there are good tech's and bad tech's..just like any other profession.
these guys and girls have the best chemicals and granulates there are to get..
if you see a tech servicing a lawn that is what we call "hurt your eyes green" who can bet:00hour your last dime he or she knows what they are doing.Stop and say hello w/that pleasing personality of yours and pick their brain..The good ones loves to brag on their work.
soil..great seed..pre emergence and post-emergence treatment for weeds...quarterly fert treatment..sharp blades[want to see a green yard turn brown tip cut it a few times w/dull blades....alternate cutting direction each week...use the "White House" length in the summer..I keep all the lawns[not yards] 3" and higher for our extreme heat in the summer[this promotes a deep root system]...watering is also very important..water early morning during the summer[[beat the sun before it reaches the roof top]..fungus loves the lawns that are watered in the late afternoon or at night...
creating a great lawn[not yard] is tuff in the spring...it can be done though..fall is by far the best time especially if you want to start from scratch.
One of my friends has been creating and caring for "White House Lawns" nearly 15 years..He advises me on all the care necessary for the 27 estates I currently maintain..Feel free to get my e-mail from Jack and I can either answer your questions or have you an answer in hours.