If the slope is that steep, I wouldn't want to till up the soil up at all since it will erode away. I would get an ATV with a sprayer and go the no-till route instead. You could plant an acre or two with a pull behind seeder for large seeds and a hand seeder for small seeds like clover, rape, etc. Having a cultipacker will help get good seed to soil contact, but if you don't have one you could just run back and forth with the ATV.