Photos can only be deleted using a synchronisation with your PC unless they were added directly to the Photo app - perhaps received as an attachment to an email. Other photos must be deleted from the PC and the iPad resychronised.
To email a document from Pages, go to the My Documents view. Line up the document in the centre of the screen that you want to send. Now touch the 'curly arrow' icon at the bottom of the screen and you'll be offered a variety of options, of which one is to email the document.
Tim