yes, you definitely need reservations for the main dining room at V&A. call wdw-dining and listen to the prompts as to which number to select. you can make reservations 120 days out. http://pscalculator.net/pscalc.shtml this should help you as to when to call. enjoy! this is a dining experience!
Yes , you will need a PS.
WDW-DINE will refer you to a different # for V&A reservations--they need to confirm with a credit card. I believe the direct # is 407-939-7707.
It's all handled thru Disney "banquet" dining.