re tools for spark plugs, the Fazer tool kit, located under the seat, behind the rubber cover towards the rear lights, (if that makes sense) has a plug spanner, I've used it twice now and it does a fine job.
Just be careful not to cross thread them when you put them back in oh and TOP TIP, get an air duster and blow all the dirt and crap from the area around each plug BEFORE you remove them otherwise it will drop into the space vacated by the plug after you've removed it.
Maybe get a haynes manual, very useful for doing DIY on the bike. I'm no mechanic, I know my limits, which is about 3 spanners in Haynes world, that more than covers the basics such as spark plugs, checking air filter etc.
Also worth considering getting a manometer for balancing your carbs, another easy job, there are some great instructions on this site that I followed with no problems. Balanced carbs will help the bike run smoother.
http://foc-u.co.uk/index.php/topic,91.msg340.html#msg340