Apple Developer Program - Membership for one year

I am new to Apple development.I want to create apps for iPhone.

I have enrolled to Apple Developer Program - Membership for one year now and i found the order details.when i tried to print the order it says "We create an invoice only after your item leaves our warehouse. Once the item is dispatched, you can request an invoice.".

I wonder do they have anything to deliver me? What is the delivery items for the above subscribed program?

Please guide me on what is the next step?