A pH of 5.1 is low. Lime as soon as you can, and work the lime (plowing is best) into the soil. Do not plant clover this year, the pH is too low. I would suggest an annual crop such as oats, brassicas, or corn. They can tolerate a lower pH. You could plant a perennial like clover next year, after your lime has had some time to react with the soil. Do not add more N fertilizer to the soil than your soil test recommends. N will leach out of the soil, so a spring application is safer. You can build up P and K levels (if the soil test said they were lowor very low) by adding fertilizer and plowing it into the soil, but it will be difficult to do unless you can get fertilizer from a local coop.