I'm Starting Pointe Next Year, Any Advice or Exercises?

It sounds like you've got a good strengthening regime already, but ankle and leg strength is only part of the equation. You will need more core strength in order to transition seamlessly from flat to pointe, so I would strongly recommend that you add some Pilates. You can find DVDs in your local library, or if you have Comcast/Xfinity cable there are some good workouts available on demand. I recommend Nicole Stewart or Tandy Gutierrez because they stick close to the original, whereas many other trainers veer off into calisthenics, defeating the purpose. You can drop the crunches because Pilates will take their place, and forget about doing arabesques without supervision as another person suggested. Unless you are doing them absolutely correctly you run the risk of weakening or injuring your lower back. Pilates will do everything and more than mindless repetitions of arabesques. Good luck on pointe!