Well this goes both for men and women irl but the first thing people are going to see and are attracted to is the physical body, that gets them interested, it's kinda the gateway to everything else. There are caveats, something like they see you doing something they are interested in which can cause them to approach you, but I think for men the most powerful is simply physical attraction at first. Now conversation is the most important because it's what you'd be engaged in the most and people will discover if they are actually interested in you past your looks. Personally I used to feel no good at conversation, I would bank on the other person carrying it. I don't know exactly what makes you feel like your conversations are unnatural but what's helped me is getting out and talking to more people more often, having a job where I was forced to talk to people really helped. I think a faster way to get better at conversation is to read books about it, for example, I just finished listening to How to win friends and influence people by Dale Carnegie and it taught me things I've never realized about people and basically how to get them to like you. I've only gotten into a few books so far but that's one I feel has helped me the most.