How to flirt with a guy

1. Wear something that makes you feel flirty. Flirting is all about attitude and while a guy's receptiveness to your flirting may depend greatly on how you look, the most important thing is to dress in a way that makes you feel good about yourself. 
2. Be payful. Don't be uptight. Don't worry about how you look. Don't get too hung up on everything being perfect. Just relax. Smile. Be goofy, crack jokes, and laugh. Be laid back.Have fun. Don't be afraid to tease him a little! (Just don't go overboard—the point is to be playful, not mean.)
3. Use positive body language. Angle yourself toward other people, sit or stand with an upright (but not stiff) posture, and uncross your arms. Make eye contact. Smile often. See How to Look Approachable.
4. Break the touch barrier. Touch him lightly on the arm or shoulder when you're talking. Just make it a quick, innocent touch, and don't make a big deal out of it. Holding hands is also a good way to break the touch barrier. The simple act of touching can strengthen the intimacy between you and him.
5. Compliment him. Be sure to compliment them in a casual and friendly way on things that are true. Sometimes, people will make up compliments just to talk to someone, but that is the totally wrong way to give a compliment. You really should compliment on things you really like, so you sound more sincere naturally. Sometimes, complimenting their family or other things they are proud of works.
6. Show interest. Get to know him by asking about, and showing interest in, his life. Ask about his interests, jobs, family, friends, etc.

"Don't wait for a guy to make the first move, because girls can generally get away with breaking the touch barrier earlier in a relationship more than guys can."