Thanks for writing in!
We're happy to hear you're using X theme to create your website.
We can point you on this direction. Let us start first with validating your site. To do this, please refer to:
Based on how you tell us, this will be a big website. Now, kindly create your child theme:
Lastly, create your pages, and edit them on Cornerstone. Here you can add elements such as buttons, image, quote, etcetera:
Hope these resources will help you get started.
Can you share us your website URL/username/password in a secure note so we can take a closer look on that issue?