As a new faculty member, your advising duties will evolve naturally from your teaching relationship to students. You will not yet be the official advisor to first-year students, so you can spend this year getting to know the Middlebury curriculum and students. Your "advising" will largely involve students who know their way around the curriculum and are familiar with college policy.
When you teach a First-Year Seminar, you will become the general academic advisor to the students in your seminar. In the meantime, students intending to major in your department may request you as their major advisor. Read the College Catalog and consult your Department Chair to be sure that you understand all departmental requirements (many departments provide an advising checklist of major requirements to be filled out for each declared major).