You will be responsible to set up all of the organization's email addresses. We do NOT provide support for Google Apps or Zoho Mail. Both services have help resources available to you.
Google Apps is free for accredited education organizations. Non-profit organizations can get Google Apps for education for free through Google for Non Profits, but it's a process.
If you don't want to hassle with Google for Non-Profits, and you can get by with 25 or less email addresses, head to Zoho Mail to setup individual addresses for your organization.