I would like to create a program (if it could be a Word Press plug-in, that probably would be ideal) that I can install on a site to facilitate membership functionality which allows certain users to login with a username and password that the users create on their own, then be redirected to their personal page where they can view information/messages that are specifically tailored to them and no one else. I would also like them to be able to view, print, and download files that I place in their personal dashboards/directories that only they have access to. And all of this should be done securely.

If helpful, I do have an existing membership site plug in.  It just doesn't have this individual user functionality.  I think one could use the existing code to create the additional functionality.