In spark plugs you can use both iridiums IK16 or IK 20 densos similarly in ngk bkr6eix-11 hav to chose as per ur driving style.
Rest in routine maitenance .
Oil changes after due time(Depends on oil quality) mostly after 3000 3500kms.Transmission oil after every 40k kms and same for fuel filter.Valave clearance (tappet settings) after every 15 to 20k kms agains depending on ur driving style.