Using NOOK in INDIA
I am using NST in India for the last 6 months. Register your Nook as described before, you can use an Indian address. Turn off WiFi thereafter. You cannot buy book from the B&N bookstore. But there are plenty of free ebooks available to keep you busy reading, you can also use nonDRM ebooks bought from other ebook stores.
Nook is not a good device for reading PDFs. In fact, PDF is a very poor format for ebooks.
Download and install Calibre, You can manage your nook with it. use calibre to transfer books to your Nook.