Hey there,
The two users above pretty much said everything, but I just wanted to say that I think the most important thing is to push yourself out there. The first day is when everyone is looking to make friends, and as long as you're friendly and nice on that day, you'll probably have secured the friends that you'll hang out with during your program. You might think to yourself, "This first day is too scary, I'll just talk to people tomorrow", but that's just making it harder. The first day is the easiest to make friends and all you need to do is be nice.
Feel free to message me if you would ever like to talk!
Kyra