Rising Freshman at IVY needs career advice

Hi, I've recently joined this site, but have been casually lurking for around a month.
Anyways I was wondering if I could get any help finding a job/nailing an interview.
So far my resume has only two jobs:

1) an unpaid researcher/intern at stanford management science department in operations research, where I helped write minimal distance algorithms for a collab project with google streetview. Summer before my senior year
2) Also unpaid job in a small hong kong investment firm due to visa issues (need visa to get paid). The owner was a former chairman of the hk stock exchange. I shadowed his son throughout the day, compiling really basic reports (which to my knowledge were never used, but I won't mention that in my resume), doing data searches, updating new positions on the staff roster. I was supposed to gain a basic understanding of portfolio management but the secrecy, esp. around fund manager meetings really left me blank. I felt more like a gopher, and the informal nature of daily meetings where ppl basicaly shot the shit really surprised me.

Under relevant leadership experience:
Managing editor of student newspaper (no Editor in chief)

I'm primarily looking for a good book to gain a more solid understanding of finance and help me nail questions about my second job since I felt like i really didn't learn as much technical knowledge/understand as much as I should have. EX) If someone asked me about general takeaways I wouldn't really know what to say except that people seem to sit on their asses alot shooting shit and throwing buzzwords. But if someone asked what my basic data searches were that would be ez, like I used a bloomberg and searched for xyz on stock abc. I have been reading investopedia, but I find it too sparse, and though I've done discounted cash flow at my previous job, I never learned the reasoning behind it. All i did was punch in numbers.

Anyways, sorry for the long post, any help would be reallllly reallllllly appreciated. Thanks in advance - OAB