Unless you're willing to come super early, take the train. Parking is limited, the parking lot is only for employees that work at the school, and none of you have permits to even attempt to blend in.
As for the rest of schoolcar, after the first week, you'll be reporting to the various yards where they have training rooms. For the A division, enjoy Livonia, Westchester, 239th St, Mosholu, E 180th St, and Van Cortlandt. Parking is somewhat meh outside of most yards, but E 180th is probably the worst with very limited street parking nearby, and Mosholu a close second.