Okay, I'm a cynic, but this is still good advice.
The most difficult part will be not grabbing the first kind of cute, insistent girl you meet and staying with her. There are so many stories about newbies arriving and finding a beautiful Thai girl, taking her back to your room for fun, etc. then realizing a few days later, hey, she wasn't actually that cute because they've seen 100's of better looking girls since... I'm only saying that it will be very easy to meet a lot of girls, just relax, take it easy, look around and don't jump on the first one you see, unless of course you've looked around a lot and decide to go back and find her. Also, remember, if you fail to hook up with a girl you had your eye on one night, odds are you can find her again the next night in the same place.
Have fun! How I would like to be a newbie all over again, walking around with those glossy, disbelieving eyes...