Thanks, sounds good. Ive lived here two years and only fertilized once and doubt it was done before that. I've got some extra general purpose in the shed that I can put down to help the soil. I'll also get that sample done so I know what to do next year.
Wish I could point you to soil labs. The UofI in Champaign or the Illinois Soil Survey part of the Department of Natural Resources should have a list. I doubt, given our financial situation, we provide them for free. A comprehensive soil lab test for a residence should not be expensive though.
The soil lab will tell you how to gather samples and label them. Make sure you sample several points of your yard as long as you are doing this. So often during construction projects land was scraped of its topsoil and it was either removed or redistributed and then new topsoil brough in from elsewhere (or not at all). So you may have different conditions in different areas of your yard.
Search this site for soil tests. A poster posted a nice set of results recently that will give you an idea of the information you will get back. It suggested what was needed to balance Ph and had recommendation for nutrients.
Come next Spring, the Scotts program is not bad for the residential customer to implement but it is expensive---especially if you have lots of turf. With soil test recs in hand, you can buy and bulk and save a bundle. You won't get a pretty lawn picture on the packaging though.