I've learned that you should kiss a woman's cheek after you meet her for the first time, as you are parting ways. Kiss every girls cheek for that matter - old girls, fat girls and hot girls - it should come naturally and they should love it. As for the ones you like, if they really love it you'll feel a burst of their emotions as you kiss their cheek, even after just a few minutes of talking with them.
If you get a date, kiss their lips upon greeting them every time thereafter. Save the tongue for late-night when you are in bed, etc.