A fun thing to try out, if you’re into a particular fandom, is to add fandom related items to yourself before embarking on your first day. Whether it be a t-shirt or a pin on your backpack- I did both- it can help you out!
I used this trick on my first day of freshman year and made several new friends! Technically, what happened was a student talked with me about something or other and he helped me find the geek group in the cafeteria. A few of them commented on my Kingdom Hearts shirt and anime-related pins that I’d bought at conventions. Granted, you don’t want to solidify a friendship based on the two of you loving similar things, but it doesn’t hurt to attempt this.