Hi Twisty
Good bike that's my preferred weapon of choice.
That NGK DCPR8E is the correct plug.
Looks like the previous owner wanted to sell it rather than pay for a 30k service.
As Loony said did you get the books and service history? and the dreaded read key very important.
If not as per Loony said give it a good once over belts etc
Oil use any premium brand oil recomended for your bike, i am using Fuchs 10/40 semi synth basically that's all my local bike shop /repairer carries
And buy all the other consumables there as well plugs/ filters.
At 30k service
The valve clearance will need checking and unless your very good on the spanners best to get the mechanics to do that.
Check your brake pads /change the fluid.
Check the timing belts.
Check the oil filter screen on the right side of the sump it has the oil temp sender attached you will need a big socket can't remember the size!
and fork oil when was that changed?
Fuel filter about $40 in side the fuel tank
Air filter
That will keep you busy for a few days