Redirect URI AND send client browser a custom message

What you are asking for is possible - you need to return (or redirect to) a page which will display your message then redirect to the target page. You web developers should be able to help you with the contents of this page but it would be something along these lines;-

if { [HTTP::uri] contains "resources"} {        
    HTTP::respond 200 content { Please bookmark the next page}
    return 
}

Alternatively just use a 301 redirect to the target page which will not show the user a message but should get cached in the users browser. This may be preferable in some ways;-

if { [HTTP::uri] contains "resources"} {        
    HTTP::respond 301 Location "http://www.mywebsite.com/newresources/todaysnews/" 
    return
}