We've never made a PS for a meal at VB, including the breakfast with Goofy and Max.
I would just call Priority Seating when you get there. There should be a button on your phone to press or something near the phone telling you who to call.
If you like seafood, make sure to try the seafood buffet.
If you like sorbet, they make a different flavor every night. It is really good. I often just go down to the hostess/host stand at Shutter's and order some to go.
Have fun.