Welcome to VW owners club,
If it does not have an updated tensioner, that would be the first thing you should update, as the old tensioner can fail and lead to totaled engine. You should also update the PCV, and maybe a new CAM Bridge spool valve.
Did the tensioner issue affect the EA113 in the Golf R as well? I thought it was only bad in the gen 1 EA888 in the GTI?
Welcome to the club! These cars will treat you fine, but they require a bit more attention than your average auto.
Goes without saying, but oil change is a good idea. Depending on the color of the coolant, I'd flush the system. As well as flushing the brake fluid - VW recommends every 2 years for that.
Get it up on jacks or a lift, take the tires off and inspect all your CV boots, axles, bushings, ball joints and tie rods. Replace anything that looks sketchy.
Is it a DSG? If so, it'll be worth looking into the DSG service. If manual, go ahead and flush out the gear oil - it's even easier than an engine oil change if you're manual.
Cleaning the carbon off of the backs of the intake valves is another thing to look into that can plague higher mileage GTI and R.