Stay calm. Think of what you want the person your talking to feel when they are talking to you. Focus on what you want to express and show that your interested in flirting. The guys will talk back once you express yourself as open to talk and approachable.
Dont be all fake and try to act as something you're not, don't try to imitate people on tv. Just be nice and friendly show who you are and pretty much just be who you are. Good qualities in someone can be very attractive. And of course smile and be light!