Most Helpful Guy
Communication is key. A lot of girls just babble, and then complain guys don't listen to them.
Try to discuss something worthwhile. Bring an interesting topic to the conversation. Some subjects are bound to divide opinions -- it can be fun to clash different views every now and then. I always find that when men and women antagonize each other verbally (in a good way, ofc) and take the trouble to express themselves in a coherent manner, they become closer and learn to respect one another. Also you'll learn more about the guys you talk to, how they think, what they like or disapprove, etc.
As long as you don't overdo it or try too hard, you can introduce some kind of little debate once in a while. People who have a knack for doing this are seen as stimulating to be around. Just keep in mind that you might have to deal with some BS, given that guys can be very thick and hardheaded.
When you give your own opinion, put some honesty in your words. Like you actually mean what you say. And if you don't mean it, don't say it. Be earnest. Transparency is a rare quality among the female gender. A lot of guys are insecure with women because they can't tell WTF they're thinking. Incongrous and unpredictable girls are not likely to be trusted or even approached. On the other hand, the more a guy feels like he knows you and what to expect of you, the more confident he'll be to make a move.
Hope this helps.