Nas set up and Album details for Mac

I have a Naim Uniti, which provides me superb quality audio, however, as my supplier was used to setting up streaming for PC in Windows, and I have a Mac, I believe that I am not making the most of the system.

I currently have a QNap Nas, and was advised to place my iTunes library into Wav format and place my extensive collection in Wav onto the Nas drive, then use Twonky as a virtual drive to stream.

Now that I have the Naim App for i phone and i pad, none of the album details appear on the App screen, which is hugely frustrating. 

I know this will not be pain free, BUT Can anyone suggest the best way to remedy this, and explain in the simplest non techie language for a techno klutz but hi fi nut ???

Once a remedy has been suggested, I would also be grateful for advice as to the best ripping software to combine with the set up.

I live in hope,

Walt