The way your question is phrased could be read two ways.
1) What cues will women give if they are attracted to a man?
2) How do I know if what I am is what women are into?
#1 has been addressed pretty well above, but the more you talk to people the more you’ll get a sense for it. It’s part of learning social skills- paying attention to what the people around you may be thinking and feeling. As long as it seems like she’s trying to prolong the conversation, that’s a good start. It’s all about building a nice rapport together.
As for #2, people’s interests are all over the map. As long as you’re taking care of yourself, you’ll do well. Yes, be yourself, but strive to be your best self. Wear nice, clean clothes, cultivate a few interesting hobbies that you enjoy, keep yourself in shape, and keep a positive attitude. It’s amazing how many guys I know who will start an interaction with a new woman by saying something negative, like, “nobody ever dates me,” or, “you’ll probably just get tired of me.” If you say something like that to a new person, it becomes a self-fulfilling prophecy. Or guys who only have seem to have one interest that takes up all their free time, like watching sports or playing online games, and that’s all they talked about. Fun, happiness, and positivity are naturally magnetic.