The first day of a new job is always nerve-wracking. After all, you're starting something new and unknown, and it's natural to feel anxiety about the unknown. However, there are a few things you can do to help make the transition smoother.
First, take some time to familiarize yourself with your new surroundings. Take a walk around the office or workplace, and get to know where things are.
Secondly, introduce yourself to as many people as possible. Get to know your co-workers and find out what they do.
Finally, don't be afraid to ask questions. If you're unsure about something, just ask. The sooner you get comfortable with your new job, the better.