The minumum thing needed to start your page (other than hosting and a domain name) is an index page. Design a HTML file in your favorite editor (or the built-in editor in cPanel File Manager) and save it as index.html. Now upload it to your account. Now when you goto your domain the new page will show.
The server looks for files in the public_html folder named index. It looks for HTML files first, followed by PHP. Examples: index.html, index.php