Now is the time when every incoming freshman starts to panic — they worry about classes, making friends, fitting in, getting along with their roommate... but I'm here to reassure you, it'll be fine! Don't stress too much about your first year; you'll make friends and find your place at your new home!
My first piece of advice is this: Make friends with people on your floor! Both of my best friends my first year lived on my floor, and it was great having them so close. It also makes going out together, studying, getting dinner, etc. that much easier if you already live close to them and can make plans in the spur of a moment.
My second piece of advice is to actually do your roommate agreement and sit down and talk about what you both expect and want from each other. Write it out on paper and agree to it. That way, in the future, if need be, you can go back and point out where you both agreed on a certain topic and try to resolve conflicts when they arise. And trust me, every once in a while, they will arise.
My third piece of advice is to go to as many social events as you can. You need to meet new people and find your friend group, and there's no better way to do that than trial and error. Some people you'll instantly befriend and others you will try to avoid, but living in a whole new place is a lot easier if you have people who are going through the same things that you are.
My fourth piece of advice: GO TO CLASS. Trust me, it's way harder to make up assignments later than to drag yourself to class, even on the days when it's pouring or 10 degrees or you have a massive hangover. Pop some ibuprofen and suffer through. You'll thank yourself when exams come around.
My fifth and final piece of advice is to be yourself! That's the most cliché thing anyone can tell you, but honestly, it's true. College gives you the chance to reinvent yourself, so why not take that opportunity? You're a totally different person than you were in high school most likely, and this is a time for people to meet a new and improved version of you. Make the most of it!
Good luck, and enjoy your journey while it lasts! Freshman year is a blast!