Hi, I did a year ago almost exactly what you did — 2014 GTI PP 69k.
Noob to noob, I cannot recommend simply checking the life extender (plastic bag of system-destroying hell) in your coolant bottle if the fluid hasn't been changed. I was about a week away from having all my fluids changed when all hell broke loose and I was lumped with a £2.2k bill to replace everything when it burst! Best to just remove it.
Enjoy the car anyway! What have you driven before?