For general information about working with Mailchimp, see their resources section:

http://mailchimp.com/resources/

For specific resources for Non-Profits see their guide:

http://mailchimp.com/resources/guides/mailchimp-for-nonprofits/

For troubleshooting Chimpegration see our knowledge base:

https://zeiddev.freshdesk.com/a/solutions/folders/42872