I always find it easier when I have some visuals to accompany me when I'm introducing myself on day 1. It makes me feel organized, and you always feel more confident when you're organized and know exactly what you're going to say, in order to leave the kind of first impression you want to leave amongst your students.
It's a simple four-slide file with some tips added here and there.
Slide 1: Title page with your picture and your name
Slide 2: Your self introduction in 3 words. I'm a _______, ______ and ______. (e.g. I'm a chef, foodie and philanthropist.)
Slide 3: My favorite quote
Slide: 4: Class rules