Your AOD is your first important decision when you apply. (And frankly if you don't understand the concept it helps us figure out how knowledgeable you are so that we can answer your questions.)

You've already applied, so yes you just need to move forward at this point.

In an ideal situation, you would have spent more time understanding the process before applying.

I'm surprised an attorney accepted you. They are only paid on backpay, so it's unusual s/he did. Your goal should be to be approved at the 1st stage. So, there is a bit of conflict with your goals and your attorney getting paid...