Seems like everyone is using electronic delivery for everything these days. There is soooo much information out there, you might take a look and put together a resource list of various applicable sites. A good place to start for cats is https://www.jacksongalaxy.com/ and for dogs, https://positively.com/ (Victoria Stillwell) which is really extensive...blogs, podcasts, videos etc. Some things might have broad appeal for your target audience that could be printed & included in an adoption kit. Or, you might customize based on the adoptee's particular needs (separation anxiety, resource guarding, teach to sit and such).
For education, be sure to join the HEART Network group here in the forum if you haven't already. Quite a few relevant threads there for current humane education resources. There's also an online https://education.muttigrees.org/ that has free access and PDF downloads through JUNE 30th. That sort of thing is usually appreciated in an adoption package especially for younger kids. The Maddie's Tail Wag booklets for kids are great to send home with new adopters and you can order free here: https://www.maddiesfund.org/maddies-tail-wag.htm (Eng & Sp, delivery was within a few weeks).
As it may be of interest, I've been working with our local Petco trainer to create some content for events and short videos that we can include on our social media. That helps with community outreach and is a great way to thank the store for their generosity if we can help build their business. We have created some of our own children's activity pages and such that are publicly available in the store lobby along with event flyers and that sort of thing. <3