So sorry about that. A few things...
1. The Staff, News, and Services pages are actually archives of staff-custom-post-type, news-custom-post-type, and services-custom-post-type. So, you will not see a page for these in the list of pages in the dashboard.
2. Since they are archive pages, you will get an error until you add at least one post for each (staff, news, and services).
3. After adding a post for each, if you still get the 404 error:
Upon 1st activating the plugin, did you go into the plugin options panel and click "Save All Changes"? That seems to be a necessity sometimes (I will add this to the installation instructions).
Also, if at any time you disable either the staff, news, services, or reviews (by un-checking the box in the plugin options panel "Preferences" tab, and then you later decide to enable one, you must click "Save All Changes" twice. This flushes the permalink settings. It will have the same effect as going to 'Settings -> Permalinks' and clicking "Save Changes" twice. (I will add this to the installation instructions, as well).
Hope this helps. If not, please post here again.