English workshop manuals are virtually non-existant, but this isn't a hard engine to work on. There are translated versions for sale on CD (PM Manny on these forums for info).
Oil filter - Same as 1996 Vienta V6 oil filter
Fuel filter (equivalent) - Ryco Z383
Air filter - Get a HKS or equivalent. Stock airbox is mighty restrictive.
I do all my own work, and I'm not a mechanic. Pretty reliable engines when treated properly.