If you don't have an Astra account, set one up - it's easy.
Go to the Astra page in your browser astra.datastax.com.
Let's create the database. In the Astra page, follow the steps outlined here. To make life easy, we have recommended the values you should use for this scenario in Italics.
On this dialog, click View Database.
When you see the active status on this page, your database is ready to go.