I would suggest creating the page you want with the modules you want on it and then use it as a template. I'd add dummy content into each module too so they know exactly what you want them to do and only give them access to add/edit the module content. This lets you control the modules they have access to so all of the pages stay uniformed.

You should set the pages as visible only to Admin and 'Regional Manager' roles until they have been approved by the Editor who can then set them as visible to All Users. By only give them module editing rights, rather that Page Editor rights you will encounter less issues and they will be less frightened by the task! Good luck.

My idea does require you (or someone else) to create the pages for the Reg Managers. Perhaps I'm not very trusting. :)

An alternative would be to add a page called say "Regional Managers" and set the Permissions for this page as Edit Page for the "Regional Managers" role. They could then add their own page under this page but not under other pages on the website. The draw back is that they could also update each others pages. If you go down this road, I'd suggest a simple How To document showing them how to Add Page with the settings you want such as the required page template etc.

Regarding help, I'm guessing you are referring to http://www.dotnetnuke.com/About/DotNetNukeOnlineHelp/tabid/787/Default.aspx right? I am the author of this resource and am currently updating Online Help for DNN 4.5.0 so I will keep your comments in mind. Thanks.