You are responsible for your own transportation from the airport. You will receive detailed instructions on how to reach your housing a few weeks before travelling. Save them on your phone or print them!
The NYU Paris staff are very helpful with this, they will help you locate the nearest metro stops and buy a Metro Pass (called Pass Navigo). Make sure you ALWAYS carry your Navigo with you and have fun!
Take a Walk Around Your New Neighborhood Check out restaurants, and locate your local grocery store (supermarché). Paris is known for their food culture, visit open markets for fresh produce, meat, and fish. Locate the nearest metro stops!
Stock up on the basics, like toiletries you didn't bring with you from the US.
This seems obvious, but for some reason people forget. Just do it.