I'm in Eastern PA and as it's just the start of April - I would like to turn my poor excuse for a lawn into a nice, level, uniform grassy green lawn. It's currently very uneven with high spots, low spots and rocks - I'm working on leveling everything by getting rid of the rocks, eliminating high spots and adding new top soil in low spots. This part seems pretty straightforward. I'm not sure how much of the lawn is actual grass and how much is unwanted stuff like moss and weeds. Considering I'm going to be doing this now (first week of April) - will tilling the whole lawn kill everything that's there now? Or would I need to treat it all with herbicide first? Here's the process I had in mind - I'm looking for some critique if I'm doing anything wrong:
Remove excess rocks & high spots
Fill in low spots with fill / top soil
Till everything, mixing in some new top soil to get a consistent soil
Level everything with a homemade drag level
Spread grass seed
Add an additional thin layer of top soil
Use a lawn roller to compact everything
Water & wait