As soon as you can tolerate pressure on the ball of your foot, begin stretching your ankle using the towel stretch. When this stretch is easy, try the other exercises.
You may do the following exercises when you can stand on your injured ankle without pain.
If you have access to a wobble board, do the following exercises:
After you are able to do these exercises on one leg, try to do them with your eyes closed. Make sure you have something nearby to support you in case you lose your balance.