Restrict page editing options

I need to allow each user to edit just one page each and I want to exclude each page from the site menu.

I have the “Exclude page” plugin installed. I need it to exclude pages by default and then I want to hide the option from everybody apart from the administrator

I would also like to hide the categories options from everyone but the administrator.

Any help would be appreciated, I am using Twenty Eleven theme.

Any help would be appreciated thanks