I'd say just make sure you have an extra of everything you can fit on your bike without sacrificing too many other things. Spark plugs, tire repair kit, allen wrenches, fuses, some bright/reflective rain gear (will serve two purposes), a couple bottles of emergency water and some snack foods, maps, medications, and whatever else you can think of in addition to the clothes and souvenirs and miscellaneous other items you'll be stuffing into your saddle bags or tour pack.
As for preventive maintenance, just have it throroughly checked before heading out. Lube the cables and check brake fluid, etc. That you could either do yourself if you feel comfortable doing it or take to a mechanic or a friend that you trust.
"Dude, women are like Vol-Tron. The more you can hook up the better it gets!" --RvB
Currently waiting on a new hip before I can get a new bike.