Well first MMarta, welcome to the forums! Glad you've taken the time to post so we can help you out.
You would want a business account for a non-profit. As well, you will want to make sure you have documentation of your non-profit status as we'll need to verify that. To get a jump on things, you can view our Acceptable Use Policy under 'Activities Requiring Approval'. There's some contact info there you might find useful.
