US Service Academy's Application (USMMA)

I am a jr. in HS looking to maybe apply to a service academy and have a few questions…

  1. A friend of mine told me that I have to begin applying now, but I am a junior... is this true, and how so?
  2. Does legacy count at USMMA? I have a legacy parent, but they have not donated. Is this okay?
  3. In the USMMA academy, my parent never went into active service afterwards, is this still true? Will I be forced into the navy if I go to the USMMA? If so, for how long?
  4. One last question - I have heard horror stories about sexual assault over seas. What is currently being done, if anything to fix this?