It is very important to give a good impression on a date but not to overdo it. You want to show your real self but also demonstrate all of your good points without being false. The first thing is to dress appropriately, try to be on the smarter side. Offer to pay for things and let them make choices and things like that.

Try to let the conversation be two way – tell them something about yourself but also ask them about themselves. This can be hard when you are nervous as people tend to either go quiet and shy or talk too much so the best thing is to try to relax beforehand.

Try to do some deep breathing exercises or some muscle relaxation or perhaps burn off some adrenalin with a session at the gym. If you are calmer then you are likely to be better behaved anyway.

Try not to put too much pressure on yourself because it may lead to nerves and also may lead to you behaving in a false way. Try to relax and enjoy it as much as you can. Think about your good points and try to demonstrate those as much as you can and even if you are not having fun continue to behave well as your date may just be nervous and may calm down and turn out to be nice but if you have made a bad impression then it may be too late to impress them.