Its not really a stupid question. If you've never done it before then how would you know what to do?

As paige says just write a ticket on the gbnstore website and ask huge tom. He'll tell you exactly what to do. Once you've paid, given him whatever details he needs and you've purchased your goods all you need to do is what every one else did first time and that's wonder if you've been conned.

And then the goods will arrive and you'll become a lifelong gbn customer. Simple as that.