How do I get AWS_ACCESS_KEY_ID for Amazon?

I'm totally new to AWS.

I downloaded some sample code from Amazon and I need to set a number of constants:

• AWS_ACCESS_KEY_ID
• AWS_SECRET_ACCESS_KEY
• MERCHANT_ID
• MARKETPLACE_ID

I just created an AWS account. I want some type of sandbox account so I can try out the code samples.

What are the exact steps I have to take to:

1. Create a sandbox account
2. Get these credentials

1. Go to: http://aws.amazon.com/
2. Sign Up & create a new account (they'll give you the option for 1 year trial or similar)
3. Go to your AWS account overview
4. Account menu in the upper-right (has your name on it)
5. sub-menu: Security Credentials