A template will only give you the layout of your mailing, not the content. We can understand you want to use the same template, but not every mailing has the same amount of paragraphs, the same images, and the same template variables to personalize your mailing. That's why is good to know how to edit a paragraph.
Learn how to edit a paragraph
In the Edit paragraph menu you can add and edit text, links, headings, images to your mailing.