Congratulations! Now prepare yourself for 4 years of relentless punishment... well, it's not quite that bad, but it's pretty tough.
My recommendations are first, to live as close to the medical school during your first year as you can, and try to room with other med students. It makes life sooooooo much easier. By 3rd year, your clinical rotations take you all over the place so it matters less where you live.
Second, start gradually studying for Step I Boards as early as possible and keep reviewing. You'll be tested on things at the end of year 2 that you will learn during the 1st week. It's good to start reviewing boards-style questions early on, and set aside 1-2 hours a week purely for boards review, in addition to your normal studying.
In addition to any text books that you are required to get for first year classes, be 100% sure to pick up the Board Review Series books, they all look like this, just in different colors:
These books have alot of high-yield material that will make your life easier.
Also, I would highly recommend the West text for respiratory physiology:
Good luck and squeeze in plenty of good gaming before you go!