Hi Atkins,
i would actually suggest watching the full Workflow 7 Installation video. It and other helpful information can be found here:
http://www.workflowswat.com/get-started
The Notification Server (NS) you referenced was renamed the Symantec Management Platform (SMP) in version 7, but they are virtually the same thing. You can install everything on the same server if you are using the 32 bit version of Workflow. If you are using the 64 bit version of Workflow then a separate server is required for SMP, as the 64 bit version is not out yet (reported to be available later this year).
Having done this upgrade for several clients, I want to caution you that some of your processes may require some rework for publication to Workflow 7. We found that some of the libraries have changed in ways that require some reconfiguring of processes, but unfortunately I don't have a complete list of which libraries are affected.
Hope this helps.
-Aaron