Tomorrow - May 30 - is the first day applicants can submit their AMCASes. Please see my recent blog about the advantages of submitting an optimal application on the earlier side.
Once your AMCAS is submitted, take a deep breath, relax for a few days, and then start thinking about your secondary essays. Here are a couple of blogs on secondaries, including how to get started on the "Why Our School" prompt and how to approach a diversity prompt.
Also, once the AMCAS is in, take a moment to do some soul searching about what you're seeking geographically, philosophically, and educationally. You want to make considered decisions when the time comes.
Finally, you can start practicing for your interviews. Here is information on my mock interview services.