Most tracks should do a quick tech inspection of every vehicle to ensure tires are good, nothing is leaking, no windshield cracks, etc. They'll require you take all loose items out of the interior (usually floor mats too) and inspect your helmet for proper certification.
I recommend signing up for a high performance driver eduction (HPDE) track day instead of an open track event. HPDE will be broken up into groups of various driver ability/experiences and usually offer a full day mix of classroom sessions and ~20 minutes on-track sessions. Typically there will be a pace car leading the pack and there won't be any passing allowed.
I'd do a HPDE beginner track day no matter your skill level just because it's a new car you need to learn at its limits (or close to it's limits on the track). Once you feel comfortable and find yourself progressively getting more confident with the car and track, then next track day you may want to upgrade to some high temp brake fluid (prevents boiling and brake fade), dedicated track brake pads, and possibly dedicated sticky track tires (if not already on Cup 2s).
But like
@TomE already said... The most important mod is seat time! Track days can be humbling experiences. You'll see a newb exotic car driver get passed by a skilled driver in a seemingly stock Golf GTI.