First you have to have a hook like, Have u ever been on Vacation. then you have to list the 3 things your going to talk about. That's really all an introduction is.
First, use an exciting or shocking event that happened as an intro. Then say something very relatable like, "That was the beginning of my wild summer" or something like that.
And it depends on your professor, is he formal or informal? Does he accept informal writing?