First, congratulations on graduating so early!
I remember starting college, it was big and seemed like I would get lost every where I went. I slowly learned though, colleges are setup to be as helpful as possible. Don't be afraid to ask faculty and staff for help, as well as other students. I walked all over campus for the first semester before I finally learned the shuttle was free :-)
I recommend finding the location of all your classes a day or 2 before each semester starts and map out a good route to get to them. Know where the restrooms are along the way and figure out where you're going to eat.
Take things one step at a time and remember why you're there. Be willing to learn and heed the advise of those who've already been there. Know that some teachers are going to be great and want to see you succeeded while some are just going to be going through the motions.
Know that you should not only learn the content but also learn how to think and apply it. I recommend finding at least 1 academic organization to join, it makes finding like minded friends easier.
Don't be afraid to sit towards the front of the room and don't be afraid to ask questions of those around you.
Stay in contact with your advisor and have a good relationship with them. A good advisor will go the extra mile to help you find the resources you need.
Don't wait until the last second to register for next semesters classes. The moment you are able to register, do so. The good classes go fill up fast.
Finish school on time and if doing student loans, don't borrow even 1 penny more than what you need. Student loan debt can be one of the biggest sources of stress for college graduates.
Most importantly, enjoy your time in college!