I just moved into a new house and need help with my lawn. I have very large walnut trees that have dumped tons of small leaves everywhere. I just raked the entire yard (15+ compost bags!) and noticed that most of the lawn is pretty thin, most likely due to the leaves sitting between the blades of grass. I also have some completly bare spots (from old swing set/sand box) on the lawn that I need to fix. I live in Des Moines, IA and I think I have a Bluegrass/Rye/Fescue mix that is 35/65 sun/shade mix. A lawn care company (rollover service from previous owners) put down crabgrass preventer last week. Any suggestions without seeing any pics?