LOL. Feel free to hang around here. There is a lot of of good info. When I started college, I lurked around here for a couple of years and learned pretty much everything I needed to know about being a premed in the process.
Focus on your classes. It's easy to get distracted by partying, being lazy, whatever. Definately have fun, though. You should work on time-management from day one so that you study reguarly and still have time to go out and get drunk and hit on drunk girls. If you get time-management figured out early, it will pay of big time as your classes get harder.
Get involved with clinical volunteer/work ASAP. It's one of the most important EC's you can do; the more the better. Starting early will also open doors in the future.
If you have time, get involved with campus organizations. There are a lot of cool people you can learn from at school, so go out and meet them. Again, this is a good EC but also a good chance to grow a little in a non-academic (but still important way).
Finally, have fun. Everyone always says "have fun, these are the best years of your life." They mean it. My freshman year was unreal, and I miss it sometimes. Don't let college pass you by (IE don't spend it all in the library).
Good luck,
S