Looking for some advice - prepping Z for first track day

DR_

You really don't need to do anything you first track event except a fresh brake fluid change. You need to top off your gas tank at least every two sessions. It wont be until your second or third event that you get fast enough to start running into cooling issues and you can make changes as needed. You will then need to start topping off your gas after every session.
IMO skip the rotors and SS lines. Good pads, like the Carbotech XP10f/XP8r and Motul RBF600 are all you need. Just swap in the pads when you go to the track and go back to stock when finished.
You will want to put in good diff fluid and tranny fluid as well.
You don't need a huge oil cooler until you get more advanced. A 19-row would work well enough for a novice-intermediate level driver.