Given that is seems like your car is barely modded, and that its your first time.... IMO a general replacement of fluids is all you will need.

Only thing I would probably suggest to splurge on would be some good brake fluid... even if you are using stock'ish pads, and change engine oil again once you get back home.

Don't bother spending dickloads when its a DD just for the track is my moto

Have fun BTW