OK so let me get this straight real quick:
1) I can transfer my old account from Xbox 360 to Xbox One, but I can't use it for Xbox Live playing or Marketplace buying. But I can use this account to play games on my Xbox One (offline) for achievements and stuff.
2) If I want to play online or buy stuff from the Marketplace I have to make a new account, with all information linked to an adress and payment information from the Xbox Live region I pick. So say I make a new account and pick German region, I have to fill in a German adress, and German credit card or German pre-paid card.
3) Once Xbox One is released in Holland, I can connect my primary account to the Dutch Xbox Live region and use it like a regular bought Dutch Xbox One.