You don't need to use a credit card, there are instructions on this page for how to create a new account without giving a credit card number : http://support.apple.com/kb/HT2534
If you want to buy content from the store as opposed to just downloading free items then you will need a valid billing method e.g. a credit card or, if they are available in your country, you could use iTunes gift cards (which are country-specific and can only be used in their country of issue).
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