Each new blog entry opens a page with a preformed box for blog entry. Does all of the entry have to fall inside this box? Can I put a first section of text inside this box, add a seperate image block to follow, then add another text block to continue text, and so on? Or do I enlarge the preformed box and put everything inside that, using Return to add space for images?
Hello Stemperley 
You can customize your blog pages as you wish by adding images and other text blocks. However, I advise against using line breaks to insert images within the text, as this might complicate the layout on the mobile version.
Note that the “Wrap text” option allows you to automatically adjust the spacing between the text and the image. To use it, click on the image of your choice, then go to the “Arrange” tab, enable “Wrap text,” and adjust the settings as needed. This method is much cleaner than using line breaks.
I invite you to visit this page: Blog | Sparkle Documentation. You’ll find a video at the bottom of the page that will help you better understand how blogs work 
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