In all these shaped objects, they can be resized to make them bigger or smaller. Therefore, you still have to have the appropriate font size for text within them and the appropriate proportion sizes also for the graphics within them.
If you’re lucky enough to buy software that lets you work ‘backwards’ that would be great! You can re-size objects, layer them, even number them mentally in your mind to keep track of them. Then, look at the code that the software generated to see how your formatted template (such as a newsletter) was created!