Is there a template?
Some examples of diagramming using Draw.(They are in Portuguese)
https://www.schiavinatto.com/mundolibre/convite-de-casamento-moderno_lm12.html
https://www.schiavinatto.com/mundolibre/criando-um-zine-com-libreoffice-draw_lm06.html
.
The source Magazines are here:(They are in Portuguese)
https://pt-br.libreoffice.org/projetos/revista/
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Thanks, I was actually able to find something in the archives about setting the margins, etc. shortly after asking the question, and was able to get the invitation made.