Check the soil ph and lime as soon as possible. I would start out with buckwheat in mid to late spring. Till that in to the ground in late summer. Then plant a mixture of rye, oats and red clover about the beginning of September.
Next year your field will be ready for a perennial like clover, alfalfa or annuals such as corn and beans. Lime again if needed. If you don't want to spend a lot of money on lime and fertilizer, go back to the buckwheat, rye, oats and red clover again. If there isn't much agriculture in the area, the deer will tear it up.