Here is a parts manual which will be of some use...
http://www.carlsalter.com/download.asp?fileid=068117099097116105095077055053048032068097114107032080097114116115032050048048048046112100102
You will need....
10mm allen socket - For the oil drain plug. You can take the plug out with an allen wrench (hex key) but you'll need the socket to properly torque it back into place.
21mm socket - To remove the oils screen. Again, a wrench would work here, but you'll need to torque it later anyway.
Some kind of filter wrench - This will depend on your bike and the filter to be removed. (We'll look into the details later)
A container to drain the oil into - I use one of the flat oil change containers with the wide, flat funnel that screws into the side.
Oil filter
Oil - About 4 quarts. This varies a bit by model and displacement, but 4 quarts should be the max.
Oil drain plug crush washer
Oil screen crush washer - A Ducati dealership once tried to convince me that these were the same. It made me think that they had never changed the oil before either...
Tech sheet...
http://www.ducati.com/bikes/tech.jhtml
And the manual is here...
http://www.ducati.com/bikes/manuals.jhtml
Hope this proves useful..if so please rate me.
Thank You.