Before I respond, I must preface with the fact that my Monster is a '99, so things may have changed a bit. And, I ahve no idea how it will effect your warranty, better check on that pronto.
Oil changes are easy. You can find directions for them online. Basically, you should have a drain plug on the bottom of the engine. The only thing that bears mantion is that, at least on my '99, the drain plugs are notorious for stripping. One option is to secure a good billet aftermarket replacement so that you won't have to worry about strippage upon reassembly. I think Motowheels.com carries these plugs. Cal-cycleworks might as well. Chris at Cal-cycleworks is a fountain of knowledge, very helpful, as well as a good source for Duc stuff.
The oil filter is pretty straight forward. Take the old one off, fill a new one with oil, let it sit, then top it off and spin it on the bike.
Now, on the lright side of the engine below the clutch is a big hex bolt. This gains access to a little prefilter screen. Loosen the bolt and the screen and everything wil come out as one assembly. Inspect for metal shaving. You should laso do this with the oil you drain out of the engine. You'll see some small stuff for sure, but it shouldn't be very large. Clean the screen as good as possible. I'm not sure which solvents you can use and which you can't, so I just wipe it off the best I can. Reinstall and tighten things down and fill with oil until the oil level is between the marks of the inspection glass. Crank the bike and let it idle for just a bit, then top off as needed. Oh, you should also replace all the cruch washers, if not every oil change, at least every other one.
You can also find oil change info at Ducati Suite, but the fella that does that site has a '98 M750.
If all else fails, post questions on the Tech forum of the Ducati Monster List. The Monsters use the exact same engine, so oil change, and probably emmissions, procedures should be the same.
HTH.
