In Scribus, the process of creating a template begins just as it would for any other document. Simply select "New" from the "File" menu and the "Document Properties" dialog box will appear.
When making templates, it's important to remember that your aim is not to create a finished document, but rather a useful base layer from which you can quickly and easily create other documents. This means that you need to think not so much about the aesthetic beauty of the page elements, but rather how they can be efficiently optimized for a particular type of document.
One of the most fundamental aspects of your document is your page setup and margins. If you regularly use a non-standard paper size or have particular margin, trim and bleed configurations that you use, putting them into a template file will save you having to re-enter the details time and time again.
If you wish, you can add placeholder elements to the document, such as sample text and temporary images. Doing this helps you visualise the final design and allows you to easily distinguish one template from another - useful if you build up a portfolio of your own templates.
It's also worth setting up paragraph styles and applying them throughout the document you are creating. Doing this will allow you to make broad changes to the typographical style of any documents you create from the template, without having to individually select each text element and change the individual parameters. Here, customized paragraph styles are being created for the CD title, track listing and other elements of the CD slipcase. As each of these typographical elements serves a different purpose in the document, a different paragraph style is appropriate.