Notify is for manually notifying groups of users. It can be used to notify them of new or updated resources, but it can also just send them an email. It's definitely not what you want, since it doesn't send anything automatically.
What you want is a plugin attached to OnDocFormSave that only executes for new resources. It's relatively simple and there may be one already (I may have written one, but I don't think so).
Is there a way to identify a resource created in NewsPublisher (e.g., do they have a particular parent or template)? If not you'll get emails for any resources that's created.
discuss.answer
This looks close to what you want:
http://rtfm.modx.com/extras/revo/resourcewatcher
You should be able to set up a hook that returns false if it's not that template (or just change the ResourceWatcher plugin code to do that).
Good find Bob, that looks promising. It's easy to setup but I can't get it to work ... yet.
Thanks
Todd