I just recently removed an above ground pool in may and had to seed about a 1/4 acre. After the initial seeding, I seeded and reseeded twice. Initially just to get something to grow and once it started coming in, there were plenty of weeds to follow.
It might sound corny but, you might be best suited to use the Scott's program (it sounds silly but it really works).
Get a seed spreader and spread your grass seed as explained on the back of the bag for the size of the area. Then spread the Starter fertilizer the same way. Water it twice a day for the next two weeks. Not a deep watering, just enough to keep the ground moist throughout the day.
After a few weeks, you should see a decent amount of new grass. Keep watering a few times a week, and then mow it once it gets about 1" - 2" tall. Don't put any weed killer until you've mowed it three or 4 times. You may have to just go to the Winterizer for the winter and continue to water it and mow it until it gets too cold.
In the spring, start out with the fertilizer again, then the Weed and Feed.
If you still have problems, try Weed-BE-GONE that attaches to your hose. It may take a little time, but by next spring you should have a nice full lawn. If it still s a little thin, run over it with the seed spreader again in the spring, it'll get fuller as the season goes, but follow the program it works!
Cricket (Boston, MA)