We give you a free subdomain with your cPanel account, which allows you to test your site over HTTPS. This will be shown under General Information under "Primary Domain".
For a new account, you won't have any files and you'll just see a "Directory Listing". The files for your account are stored within the directory (folder) named "public_html".
You have a few different methods for adding files to your website. Continue this guide to learn how to add files to your site.