you will need to set up an ebay account.

as far as paying, the easier way is to set up a paypal account.  you can send and receive money from paypal, and charge it up using your credit card.

as for shipping, it will depend on what you buy.  you will find some sellers in the US will not ship to you (or anyone outside the US).  an american shipping outside the US has to fill in many forms so some of them don't do it.

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"Even a stopped clock gives the right time twice a day." Withnail & I