Have been told I need to bleed ducati carby bowls, because that is why the bike won't start

Would probably need a little more info to diagnose, but if it has been sitting, make sure the battery is fully charged and in good condition( they sometimes only last 12 months), two new plugs and drain the carby bowls, to get rid of any fuel that has gone bad.

I would get a new mechanic.In a carby, there is only a few things that move or wear out.At the most! you rebuild a carby.It is a lot cheaper than buying new carbs.If yours are an original carb and you have a problem,it's most likely a combination that the mechanic can't work out.I have a 83 carby Duke and an 99 efi.They are very easy to work on and Ducati do a lot of homework to get the bikes going well.Mate! get a second opinion.Hope this helps