Holiday Plan on March 22-28 2015

hi there,

I'm planning a holiday to Japan on March 22-28 2015, with my wife and children 6 years old.
I will visit Tokyo-Osaka-Kyoto and Shirakawa Go during my visit.
My flight is Jakarta-Tokyo Narita round trip.
I will stay at Mercure Ginza in Tokyo.
I plan to buy 7 days unlimited JR Pass
My question are
1. Should I buy the JR Pass online and have it delivered to Indonesia or buy at the Narita Terminal Station when I arrive?
2. Considering my itinerary which JR Pass do you suggest for me

thank you for your help

regard
Sukiadi