Hey David,
Until fairly recently, we only did the default channel for this. The Email Program is a newer release and you can find some guides on it here:
https://community.marketo.com/MarketoDeepDive?id=kA5500000008T1kCAE
https://community.marketo.com/MarketoArticle?id=kA050000000L5zfCAC
Basically if you just want to send an email with no other flow steps, this is a nice way to do it. It gives you a really nice dashboard view and easy to setup testing.
Kim