Intheswamp said: Will tilling or discing new ground that is hard and dry harm it?
Weedwhacker said: "Do not till leaves into the soil in the Spring, you will get a globby mess that produces half-heartedly. "
I've tilled a mountain of leaves into my garden over the years (in the fall), but they were always shredded up by the lawnmower first.
kendvp said: I've never seen the disc tillers work, I think those are good for when the ground is too stiff for a rototiller to work. A rototiller will give you a much finer soil for growing.
I assume you plan on going to Home Depot and renting a power tiller for a garden that size? 30' x 60' is a little big to do by hand, unless you want to get really strong, and a little small for a tractor. Is there a landscape supply close by where you can get a truck load of topsoil delivered? And then some bulk compost to spread on top?
Does your property have good enough drainage for an in ground garden? And are you sure you want in ground and not raised planters?
sallyg said: shredding the fall leaves makes a huge difference. One year I had a layer of shredded leaves with a sheet of plywood over- wow, really nice by spring. Kept them moist and protected.