A few things I advise people to do when online dating is,
A) set up a separate email acc and skype acc under a pseudo name. That way you don't have to give out phone number straight away and can easily block.
B) never give out address until you are sure that date is as safe as poss.
C) always background check, google full name, find out if he/she is who they say they are. This is good od hygiene. I managed to talk (never met) with a delightful psychopath once, lucky for me that I had looked him up, he is now in prison for murder 
(am now engaged and v happy with lovely man, but a few frogs did have to be kissed first).This should also help to see if the person is infact single etc.
D) go in to od with expectation of widening your friendships, I found that making friends more than lovers helped very much.
E) grow a thick skin.
F) look out for red flags early on, I found it helpful to have the stance on not compromising on what it is I was looking for.
G) be honest and truthful, holding ones integrity I found helpful.
E) don't expect too much and meet asap in a safe public environment, going for coffee is best, no mixed signals and no getting tipsy. Let a friend know where you are and whom you are meeting, I always sent text from ladies saying all ok etc. friend was on stand by incase I needed to get out of date quick. I also text her when I got home.
F) never leave a drink unattended and always buy your own, I have had a couple of friends being slipped the date rape drug.
Good luck on your date and hope you have fun.
There is a daters thread somewhere here in relationships with seasoned od'ers that will offer support.