I think one should take care not hesitate too much talking to new people. The outcome can be either ways any ways, but that usually is nothing to carry around for too long time. I figured for myself it should be (and feel) casual (not only during dating).

So of you are a nerd not used to talk to anyone, maybe get used to talk to people again before trying to advertise yourself on the dating market. Usually, most of people not overly busy are open for a short chat or a funny remark*.

*Disclaimer: may differ depending on where you live.