I had a launch edition 720s that I received in August 2017 (0ne of the earlier ones).
I had 6000 track miles and 8000 track miles overall with the car. I was the original owner.
A good idea to swap out the rotors/pads for something else. It's been talked about many times over the years.
Do not rely on the brake sensors to change the pads. The outer and inner pads on the front generally do not wear evenly. The sensor is on the inner pads and in the middle of the pad. The upper and lower part of the pad wear out quicker then the part that the sensor detects. (this is even in the case if you use steel).
The party line is to get the track inspections. However, it ASSUMES that one doesn't know anything and no one is checking the car (they assume that the owner doesn't know how to check the oil, doesn't know how to do brake flushes, doesn't know if the pads need replacing, doesn't know if the tires have enough tread). The standard track checklist isn't much different then a normal HPDE checklist. However, the dealers do like to go over other things (sort of creating warranty work for themselves, software updates, campaigns (that you may not be aware of). Some dealers will always do a brake flush (which is the more costly component of the work - debatable if you even need to do this every time). If doing yourself or have a race team , then keep very good records with receipts, pictures, dates, etc. (this is for your own piece of mind and if you have an extended warranty).
For the love of god; read the owners manual (90% of the things people ask on here or are confused about are covered in the owners manual). Take your computer out to the car and go page by page and fidlde with the settings and try things out.
For tracking specifically; research how to use ESC dynamic mode (if you are not in esc dynamic mode then the power will be cutting out of corners and you'll confuse it with turbo lag). Research variable drift control, how to keep the e brake disengaed when you are powering down the car, how long to cool down the car, how long you should let it idle after hot laps before turning off the engine, the necessity to lock the car and make it go to sleep if the e brake is disengaged, power saving mode and impact to the movement of the electric seats.
More traffic on track the better for you. You don't need anyone's cooperation to pass. You'll get mad if someone gives you a point by (as if you need a point by to get pas them).
720s is by far the most tracked supercar.