If I may offer a male opinion. Talk to him. Honestly it is that simple. Somehow women are under the impression that if they are interested in a guy they need to figure out how to get him to notice them and make the first move. The most blown away I have ever been is when a woman makes the first move. If he is really attractive then you'll be ahead of the game while all the other women are still busy playing the "look at me" game

Making the first move isn't easy for anybody but if you're attracted to him then go for it.