How can I help my Dad?

My Dad has just been diagnosed with Parkinsons.  He seems frightened (in a controlled way) and worried.  He has always been a worrier anyway.  I want to support him as much as possible but I don't want to encourage him to embrace this disease.  I want to respect his need to deal with this however seems best to him, but I really believe that a positive attitude does a lot.  Does anyone have any advice for me as I step into these muddy waters?  I so want to encourage my dad, but don't want to make light of what he is dealing with.  He tends to be very pessimistic with most of life's challenges.  I'm glad I found this site as I know what amazing support is availabe through other people who are going through the same thing.  We are only just beginning, but I want to start out right in my desire to help, encourage and support my Dad.  Thanks for any help!