Have a look at the following posts. I found these to be helpful in publishing to Appsource:

msdn.microsoft.com/.../gg309251.aspx

msdynamicax.wordpress.com/.../detail-steps-on-registering-your-app-on-appsource

www.axsource.com/guide-for-microsoft-partners-to-publish-app-onto-microsoft-appsource

Hope this helps! Please click on "Yes" if you found this response helpful.

 Hope this helps, Olivia