whats the difference between a Nissan Delivery and a serena?

we recently bought a used Nissan Delivery van, and it didnt come with an owners manual. its year 2000, 2.3diesel, and the engine is under the seats not under the bonnet.
we need to get at least the owners manual, and perhaps a haynes manual. would one for a serena be the one we need? whats the difference? why can i find so little information on the net about the Delivery? there seem to be plenty of these vans for sale. nissans website doesnt even seem to recognise its existence.