Most soils that were originally forested tend to be acidic. They need lime. How much is a local/regional determination - your local extension folk's (or your neighbor) will have a good idea (ballpark) until you get your soil test results back.
vtsnowedin and dave1949 have some good ideas regarding the lime as well as another pass with the disc after the weeds begin to green up a bit.
Pastures or hay ground doesn't need the same kind of soil prep as a vegetable garden or even a lawn. IMO - another pass or two with the disc and as long as you don't have sod clumps or large clods (fist sized or larger) I'd bet you'd be just fine seed-bed wise and if the tiller is a no-go: you won't really need it.The first time or two that I worked; re-worked my pastures I worked everything to a fine puree... overkill and a
waste of time, fuel and $$, too. The last time, I had small lumps, bumps and clumps - everything sprouted up and the horses never even noticed!
AKfish