The basics for a routine service will be Oil filter (and a new sump plug washer), 4 spark plugs, air filter, possible pollen filter if fitter, and a good quality oil. I have a 1996 almera gti and change the above regulary and that is about it, done 203,000 miles now without a single engine problem. I personally like to change brake pads about once a year as well, cant put a price on safety. Other than this, top up your screenwash, check antifreeze/coolant, all interior and exterior lights, yank on seatbelts to make sure they lock etc... the stuff you take for granted. For the spark plugs, your owners book will have the type number. Failing that, give your reg no to a nissan dealer and they can tell you everything you need. Halfords have decent books with the codes in them as well for filters, plugs, pads etc...
Jeff, January 2008