1) don't take flirting too seriously....at least not right off the bat. Girls are retarded and flirt with just about everyone whether they realize they are doing it or not. (apparently I'm quite guilty of this
) Trust me, you'll know when a girl is sincerely interested and when she's just flirting and doesn't realize it.
2) Eye contact is HUGE! especially if the 2 of you meet eyes and she looks away for a couple of seconds and then looks back with a sly smile (sorta the one that says "shit he caught me checking him out")
3) body language is big too....look at her feet (yah I know this sounds weird but just do it) If they are pointing towards you, that means she's interested in you. Humans do this unconsciously. another piece of body language that is big is if they 2 of you are talking and she finds away to touch you. Like she's laughing at one of your jokes and she grabs your arm lightly. Good thing.
Rob...girls very rarely will be blunt about what they want at first. They are trying to impress the guy and get him to ask her out, so they don't want to be like a bull in a china shop and be bitchy dictating to the guy everything that she wants. She'll most likely do the things mentioned previously, and the guys just have to know how to read what she's doing and then have the confidence to say "Hey how about we go out sometime?" But I'm sorry to be the one to tell you, you're gonna have to learn Girl talk eventually (or at least enough to keep you alive
)