You won't need to know any of that, although some knowledge of business/finance is always useful.
Most of your work will be researching issues that arise during normal corporate operations, writing memos/briefs on those legal topics, and sitting in on deals at times (though don't count on this early in your career). Also, you'll be doing a TON of doc review.
As you become more senior, you'll be in charge of more important things (like the deals I mentioned before, advising the corporations on what they should/can and shouldn't/can't do).
Overall, though, it's a pretty broad field and you'll be doing most of the tasks traditionally associated with lawyer, save criminal defense.