Costumer's page edited only by admin

Hi everyone,

Im looking for some plugin or some engine for new website with this requirement:

costumer_01’s page
• created only by admin
• editable only by admin
• visible on website menu only after logged in by the costumer_01 or admin(no one else can see this page)
• on the page will be all information about the costumer_01 from the registration on the website and PDF/JPG documents(is there some plugin with function add water mark all over the PDF/JPG automaticaly by WordPress?)added by admin.

or make the page with registration where the costumer_01 will fill all his data and the plugin will prepare all automatically and the admin will fill the rest of page and activate the costumer_01’s account and page.

Can you help me with that?