Unless the number of first year . students is really big, the professors will know you by name or at least recognize you outside the classroom. It is to your advantage to have good relations with professors from the first year onwards, even tough you don’t do any (or much) research in your first year. Going to office hours and classroom discussions will contribute to this. It is also a good idea to attend the social events organized by your department, not only to have some time to relax, but also to chat with professors and other students and at.