General help

Well, yes and no.  First and last names and email addresses are required moodle fields.  For one thing, they are used for searching for one thing, you wouldn't easily be able tell your users apart if not for those and you may as well be letting them login as "guest".

That being said, there are ways to get around it, I have had clients who have done things like this.  It will require some custom coding though.  If you want to use a custom signup form, you can copy the login/signup_form.php file to the onlineconfirm folder.

Then add some code to onlineconfirm/auth.php (I don't remember if I put it in these files) like this under the function called  function can_signup() add a new function to call the new signup form like this:

/*Override signup form*/
    function signup_form() {
        global $CFG;

        require_once($CFG->dirroot.'/auth/'.$this->authtype.'/signup_form.php');
        return new login_signup_form(null, null, 'post', '', array('autocomplete'=>'on'));
    }

Then you could custom code that signup form.

As for the redirect, you can add a redirect to the user_confirm and login functions in the auth.php file under the true returns something like this:

        redirect($CFG->wwwroot.'/course/view.php?id=2);