No till from scratch, meaning un-prepared new ground, as Nathanael asked?
Tough, but still possible. I see from other posts that you are located in central Illinois, so you still have some time before last frost. Corn planted in cold soil will not germinate well, so until then, you can start your lasagna bed.
1. Lots of cardboard and newspaper, much overlapped, many layers. Don't worry about
roots penetrating this. Once its wet, and worms start working on it, roots will get through quite easily.
2. Good finished
compost or fresh vermicompost if you have it, with worms and worm eggs included (worms love cardboard). This will
feed the soil organisms that are needed to jumpstart your crop. Remember your main crop is good soil, not corn or whatever you plant on top.
3.
Water it down, get the cardboard layer good and wet, but don't wash away the compost.
4. Add whatever lasagna layers you have available, make them thin so there are no matted grass clipping layers, for example. Build it up as high as possible. 2 feet is not too much. Avoid material with lots of weed seeds.
5. Keep it moist, dig down to the cardboard layer to test, water before it dries out. The top can be dry, it protects the lower layers.
6. When its warmer, scratch shallow grooves to plant in, at your preferred row spacing. Plant your corn, cover with more compost. Water.
7. Depending on your birds/deer/groundhogs, etc, you may need temporary protection. The birds in my yard love to watch me plant and then swoop in to carefully extract each and every seed. They are smart! and they remember where every seed was planted. I also plant some sacrificial, fast germinating annuals like radishes and arugula. Birds may get some, but they will hide the corn shoots for a few days.
8. Sprinkle a very thin layer of fresh grass clippings on top. This camouflages the corn shoots, repeat every few days.
9. Add more lasagna compost as the corn grows, instead of hilling it up.
10. Maybe protect it from wind in your location?
A new lasagna bed, depending on your weed pressure and varieties, may need some weeding for the first year, but the loose compost makes that easy. Just pull it out early before it gets established. Grasses, especially - they have
underground reserves of sugar in their roots to feed the growth of new shoots. If you get them quick, those reserves get depleted. If you leave them a few weeks, they can photosynthesize
enough to become unstoppable. The farmers footprints (and attention) are the best fertilizer (and weedkiller).