Question: I'd like to start automated emails when clients purchase a plan, however, I wanted to check with you before monkeying around with code.
Answer: The SubHub / MailChimp integration will enable new members email's to be sent to your MailChimp lists. You can then choose to use their features to build campaigns or automated messages.
They have lots of add on's to choose from.
Here is our MailChimp set up guide.