First day at new job can be pretty stressful and even terrifying, it's really important to start things right and make a great first impression. In this case preparation matters, it can help you rock your first day at work. Here are some great pieces of advice on how to make positive first impression.
Impression that you make when just entering the room are often based on your appearance and body language. Dress accurate and appropriate. Figure out what is the dress-code at your new job. Be conservative in your clothes and also in what you say and do. Show yourself as a professional you were at the interview. If the dress-code at your work is more relaxed, you can also relax yours, but after everyone gets to know you.