In Ekklesia go to Content > Pages > Add a New Page
Create or edit the existing subpages for your church website.
Based on your sitemap, create the new subpages even if the content is not ready to be added to the pages. You will be able to add the content later. It will be beneficial to have all the subpages created so you can begin adding links to the pages from other various places of your website, like your navigation (menu).
Your site comes with pre-existing pages already created for you. You have the option to either delete these pages and start fresh, or you can edit the pre-existing pages to make them your own.
Help Site - Add A New Page
As you are creating your pages, visit this article to find help on adding images throughout your website. It covers everything from how to find quality images, how to create and edit graphics, and how to place images in your website.
Help Site - All About Images