Honestly, for your first day, all I would do is flush the brake fluid with a high quality fluid (like Castrol srf), get yourself a decent tire pressure gauge and have fun! Depending on how much other experience you have (read how fast you're going to be) maybe upgrade the pads. However, the stock Evo x pads aren't terrible for a novice driver. I drove on them for probably 5 track days (4 of them at Watkins Glen which is TORTURE on the brakes) before going the st-43 route. Butt your first track day should be about learning ad much as possible and having fun, not modding the car and worrying about going fast.
EDIT: just noticed how old this thread is. My bad!
Check out my 2013 EVO GSR For Sale Thread:
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