The relationship that you create with your EA is important – from the beginning. If your EA does not have clear expectations set from the beginning, the relationship is doomed to fail. This is not fair to them, and it is not fair or beneficial to you or your business when the outlined needs are not addressed, or feedback is not given.
It is unlikely that your EA will walk in and be well versed in all of your needs from the start, which is why it is important to not only train your EA, but to bring them in as a partner for the overall betterment of the goals at hand.