Welcome to the forum.
You will need something like Inkscape (free), Google Draw, Adobe Illustrator, Affinity Design or another program to create your own files. You can also buy files, use Catalog designs or search the forum for free files to use. As for making rectangles, there is a file in the free file section with all sorts of shapes and a line that you can use by adding it to your Dashboard. Here is the link to that file: Cut Shapes Template
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