Hi mate well done on your paso purchase
Its probably a good idea to get yourself over to
ducatipaso.org where you will find lots of answers to your questions . As to tyres they are a problem, you can get away with the front by using the fireblade 16inch fitment i have a Metzler it works well as to the rear Yeller duc on the paso site may be able to help you i had a couple from him about a month back he is in the usa BUT they are very reasonably priced
iT IS POSSIBLE TO FIT 17 INCH WHEELS BUT IT REALLY SPOILS THE LOOK OF THE BIKE. THERE ARE ALSO SOME PEOPLE WHO FIT HIGHER PROFILE REARS BUT THAT AGAIN MAKES FOR A VERY ODD LOOKING PASO ALONG WITH SOME SAY SUSPECT HANDLING.