First of all while Building the Application you should choose Multi Issue with itunes subscription in Viewer Type in in Viewer Builder. Now for your application to be part of Newsstand, yoor application should have an auto-renewable subscription, since your content would be free, create an in app purchase with free subscription. Read documentation available to learn how it's done.
Hello Nelle, here is a great Newsstand set-up resource from Adobe:vhttp://www.adobe.com/devnet/digitalpublishingsuite/articles/adding-digital-publishing-suit e-apps-to-apple-newsstand.html
Here is some Apple Newsstand information: https://developer.apple.com/devcenter/ios/newsstand/
As well you want to download the iPad Publishing Companion here: https://digitalpublishing.acrobat.com/welcome.html. Go to the link onth bottom right and download Publishing Comapanion Guide for iPad.
iTunes Connect Developer Guide: See page 100: Apple Newsstand Download the Developer Guide.
I hope this helps you out.