Once you have everything created you can assign the user permissions to their page by the tabpermission table.  You can find out what modules are on the page by looking in the tabmodules table.  There is an option to have each module on the page inherit permissions from the page.  If you go this route you dont have to worry about setting the individual module permissions.

 For that case you will need to take a look at permissions and module permissions.  I suggest reading: http://www.dotnetnuke.com/Community/B... .  The article itself is about creating custom permissions, which you dont need here, but it shows how to interact with Permissions.