I'm not sure about the currency you'll be using, but they will take care of that when they send your invoice / Google Checkout link. Just let them know your full name, address, items you'd like to order, and preferred payment method (Google Checkout/Bank Transfer/Cheque/Money order).
Power adapters are universal voltage, and they'll come with with the appropriate cord / plug converter for your region.
Be aware that the Pandora comes with battery, stylus and power adapter included the price, you don't need to add those separately unless you want spares. IMO they really should be marked as "extras" in that email.