Amazon is a an American electronic commerce and cloud computing company.

How can I request all information stored about me?

Sadly the privacy policy and the according pages in the support area only link to pages where you can see your data, there is no mention of a data export.

After sending an email to their support I got the same links as text. I answered that this is not enough according to the German version of the GDPR. After 5 days I got an email reply asking me for my postal address. Now I am waiting for the data to arrive. Apparently Amazon wants to make it a bit harder to get your data exported.

What data do I get? And in what format?

Not known yet. If you got your data, please comment in this ticket.

How can I delete all information stored about me?

You have to contact their support to do this.