You will need to setup an account with amazon web services.

Head over to aws.amazon.com.

You will need a credit card as this is a paid service (despite being in beta).

What are you getting?

Amazon Web Services is basically associating your account with a private key. The private key is needed to launch an Amazon Machine Image (AMI). Your account is billed, per second for all the services that you use.

(need some pretty screenshots)