Maintaining good body language is so important on a first date. When a man first approaches a woman, she will base 7% of her initial impression on what he says, 38% on his style of speaking and 55% on his appearance and body language.
Try to mirror your date, this will show you are interested and will impress your date. If you want to create an instant link say his/her first name at lease twice. This shows attention and connectivity.
Always try to maintain eye contact.