1.1. Do try to look your best and be punctual on dates
2. Do have fun when dating. I know the subject of Mr. or Miss Right is serious but dating is fun too so keep it that way.
3. Do flatter and compliment your date on the way they look and the things they wear. People tend to go to a lot of effort on a date (hopefully) so being told that you are looking good is a nice thing to hear.
4. Be interested and interesting. As the Pet Shop Boys once said, I was never bored because I was never being boring" or something similar. You get my drift.
5. Do tell someone if you are not interested in dating them again. Being lied to and hopes kept alive is an evil and malicious act (yes I mean it that strongly). If you don't want to see someone again then let them know that in the nicest possible way you can.