so where shall I apply for this credit card?
I still dont understand how it will work
At the credit card companies web site. I would recommend QuidCo, atleast when you sign up for a credit card you can get a bit of cash back!
I can't see too many giving 0% on purchases for an entire year - then again I haven't really looked. But so far all I've seen is 12 months @ 0% on balance transfers.
http://www.quidco.com/insurance-finance/finance/credit-cards/post-office-credit-cards/