Don't worry--you won't have to wend your way through the intricacies of academic life alone. There are lots of people to help you on your journey.
Freshman Advisers: Forty faculty members advise frosh on their academic programs. You get another adviser once you select your option (major). Many frosh forge strong bonds with their first adviser and keep in touch with him/her throughout their undergraduate career.
Option Advisers: After you've declared your option, a faculty member from that option will help you select courses, chart your progress toward your degree and eventually counsel you about graduate school or employment.
Upperclass Counselors (UCCs): UCCs are undergraduates chosen by each House to act as counselors.
Resident Associates (RAs): RAs are graduate students chosen by students who live in each house.