How do I create a disclaimer page?

Legal module is purely for registered users. It doesn't souind like these are registered users?

Front page is just for changing the front page from what it sounds like; ie. differing looking front page look, feel then rest of site. Not sure how it acts so can't be too certain.

I don't think either of those two sound like what you're wanting.

Not sure if there's any modules that do that; look a bit more would be my suggestion.

Or make a module to do it

ie.

<?php

function modulename_init() { // called at the begining of each page load
if (!$_COOKIE['personhassaidyes']) drupal_goto('some/confirmation/page');
}

function modulename_menu() {
// set
$items['some/confirmation/page'] = array(
// set up confirmation yet, type MENU_CALLBACK, page callback drupal_get_form, page arguments => array('some_confirmation_page')
)
}

function some_confirmation_page(){
$form= array();
$form['text'] = array('#type'=>'markup','#value'=>'You wanna?!');
$form['yes'] = array('#type'=>'submit','#value'=>'yes');
$form['no'] = array('#type'=>'submit','#value'=>'no');
}

function some_confirmation_page_submit($form,&$form_state){
if ($form_state['values']['op']=='yes') {
// set the php cookie
drupal_goto();
}
}