One of the most frequently asked questions by guys learning to pick up girls or studying PUA training, is "What do I say when I meet girls?" This is not the most useful question.

It tends to make guys think that something fairly random and trivial is really important. We will touch on this a little more deeply elsewhere. For now, the simple answer to the question is "Anything polite will do."
Guys overlook this because it is so simple, but it really is not that hard to start a conversation with just about anybody, assuming you are polite and sincere. Politeness and sincerity go a long way!

Polite compliments can still work very well. If you find a woman attractive, say so sincerely while remaining polite. For example, saying "I would love to take you behind this bar and have sex with you right now!" may be sincere, but it is not very polite. Although there are exceptions, this kind of thing will usually not get a positive response. On the other hand, "You look absolutely gorgeous tonight!" is polite and sincere (assuming you consider the woman gorgeous), and will tend to get a positive response.

If you can get more specific with a compliment, this is usually better. The classics are things like: "You have really beautiful eyes!" or "Your hair is absolutely lovely!" These compliments can still work very well, but they usually work better after she is feeling some attraction for you. A great initial compliment is something to effect of "That's an amazing dress!"

This kind of compliment is awesome because it states something polite and sincere, and it implies something more. She should know that you probably would not like her dress as much if you saw it on a hanger. You like it because she is wearing it, and it makes her look good. The implication is that she is attractive, but you never actually say this, which is very powerful.

One more note here, let us give credit where credit is due. I got this concept from Ross Jeffries. When you get someone to imagine or visualize something on their own, not only do they accept it much more, but they also tend to be much more appreciative of the compliment.

As a final note, avoid worrying too much about what to say to women. What you say is never the most important thing. The most important thing you can do in any phase of pick up or dating is have solid inner game. That is to approach it feeling centered and focused. This solid inner game lends power to your communication and covers up your 'slip ups'. Odd comments, stumbles, and stutters pretty much go unnoticed when you have solid inner game.