Good advice on this thread. The one thing I would go against is trying to live off campus as soon as possible and avoiding the cafeteria. I think these things are very school specific depending on the quality and availability of on-campus housing the cafeterias. Plus, living off campus and not eating at a cafeteria makes it more difficult to meet people.
One big piece of advice I have is around studying. Being smart about how you approach it can result in either better grades, or the same grades but with less time spent. Study in the library, not your dorm room. There are far fewer distractions and it is much easier to focus. While sitting on your bed in your dorm room studying may "feel" really collegiate, you won't be as efficient. If you have a class that gets out in mid afternoon, go to the library until dinner instead of wasting time heading back to your dorm (same goes if you have say 1.5 hours between classes). And if you are the library and just not getting anything done (can't focus, exhausted), then leave. Come back to it later or the next day. All very basic advice and it may be obvious to some people, but it took me until my sophomore year to figure it out. And it had a big impact.
When choosing classes, base your class decisions off quality of professors rather than subject if at all possible. Toward this goal, befriend upperclassmen as they can give lots of good advice on professors.
In terms of computers, a Dell computer is another option especially for bang for your buck. I get emails with deals they have probably every other day. Today is for a laptop with 2GB of memory (you need at least this much), 15.4" screen and 250GB hard drive for $650. So, not too bad. Dells aren't my personal favorite, and I know some people don't like them. I prefer HP Pavilion computers, but you might pay a bit more.
But before buying one, check with your school first. See if they have better deals, which models they support, whether there is a student discount for windows or office software. At my grad school one could get Office premium edition for less than a third of what it would cost retail.