First you need to ask what is cyber bullying? for the introduction of course.
the cause and effect of cyber bullying for the body of the speech.
and last how to prevent it from spreading. for the end.
(this site will help you, but it doesn't mean you're always depend on it. sometimes try to stand in your own. I'm sure it will help you)
hope it can help if it is just press thank you below. ツ