First off, I am very new to lawncare. Here goes...my lawn was looking very sparse, had brownish spots here and there and there were quite a few weeds. So, I applied some Scott's weed killer/turf builder. Problem is, I applied WAY to much and now it looks really bad. Although some of it is greener than ever and growing really fast, the rest is brown and dead. I live in a very public area and I am sort of expected to have a nice lawn. Also, my lawn is approx 200 sq ft. What can I do to make it all better?? :(