Don't spend a small fortune on furniture to begin with. I'd recommend getting second hand furniture to start off with, and then start buying stuff that is truly "yours" at furniture sales etc. You can find great stuff on craigslist, freecycle, or even on the side of the road. If you start looking now by October you'll have everything all set. No sense in going thousands of dollars in debt over it (made that mistake...we broke up...guess who paid for most of it and doesn't have any furniture???).
Look for jobs that will make you more secure not only because it pays you, but like others said includes some kind of retirement fund and health insurance. If you start now, it will pay off A LOT later. Make sure you diversify too and don't put "all your eggs in one basket" when it comes to retirement funds and investing.
Do different things apart from each other...including maintaining ties with your friends....but don't forget about each other either. Designated date nights are really good
You can save money on cable bills if you cut the TV cable part out and order netflix/watch your shows on the internet.
Start a savings account and put either your spare change in it or some amount of money from your paycheck.
Exercise together. You will be healthier and happier (exercise releases endorphines!).
Keep drinking to a minimum. It is a money sinkhole and can lead to fights and hurt feelings.
Don't forget while you're in college to build your resumes too. Join clubs and volunteer. It's another good way to do good things apart so you don't get sick of seeing each other all the time and still have interesting things to talk about.
Learn how to cook with leftovers. If you buy a cooked rotisserie chicken from the store (or cook your own), you can have chicken salad, chicken sandwiches or chicken pot pie for lunch the next day or for another dinner.
Cut coupons and learn how to grocery shop. There is an art to it, and if you learn how to do it right you can save hundreds of dollars on your food bill.
Have a special breakfast once a week.
Split the chores evenly. This can also lead to a lot of fights. If you fold the laundry, he puts it away. You wash the dishes, he dries etc. Keep your bathroom clean, make sure if you have hard water you put something in the toilet tank so you don't get limescale buildup. Use your towels more than once and don't keep them on the floor because then they don't dry, smell weird, and you end up doing more laundry. Do the dishes every day so you can go to bed with a clean sink.