hook_node_operation

Hi,
I'm newish to Drupal (thanks Steve for putting me in touch with this group) and wonder whether anyone can point me in the right direction please?

I want to create a view that allows you to select a number of nodes using checkboxes (I have VBO) then allows entry of an email recipient(s) using a text box on the same page as the view. A submit button then validates the email address then calls a custom function I will write that builds one email with a list of node details in the body.