With help from Milo Miller, famed QZAP co-founder, I've developed a zine template for myself for making a quarter-size zine that's eight pages long in InDesign (added May 28, 2020: 16-page version). I've also exported it to pdf, if that's more your jam. (This is not a template for a one-page folded zine. Those are easy to find.)
(Dropbox links--you don't need to create an account to see them)
ICYMI Barnard Zine Library staff are collecting COVID-19 themed zines made by women, nonbinary people, and members of the Barnard community of all genders. They will gladly buy two copies of your zine via PayPal.* They can provide a postal address (the zine librarian's home) or can print black and white pdfs on 8.5x11 paper. Email firstname.lastname@example.org to discuss.