What I did was list the premed prereq classes I was planning to take during the year, and left the rest out. As it turned out, I ended up pretty much changing the order in which I took everything. It wasn't a big deal. Most schools ask you for a schedule update at the interviews, no one seemed to mind that I had decided to take physics backwards. And the rest of the classes I ended up taking I just added then.
Just put down your best guess on classes, and then if you end up making significant and positive changes (like 200 units of neurobiology, or medical ethics, or something), then you have a good excuse to write update letters to schools later. (And depending on how things go for you, waitlists, etc., it can be nice to have a good excuse to remind schools how interested you are)