LGBT: How do you flirt? (tougher than it sounds)?

When I was in my junior year in high school, I had no idea how to flirt. I've never had anyone to do it with before. Then, I was flirting with my boyfriend senior year, but that was mostly because of an extended metaphor about Adam and Steve. Other than that, I have little to no experience flirting. I tried to think of what I was doing while I was with that guy, but I can't put my finger on what separated that from when I normally talk to people, except that I knew it was flirting.