Try to relax and just be yourself. Don't worry about whether you not she likes you. If things are supposed to work out, then they will. If she doesn't like you, then there are plenty of other girls out there who will!
first of all, smiling is very important for the first time. Do not be nervous. Have some humorous talks. Try to find out some jokes that can make her laugh. Do not try to touch her (e. g. kiss, hug, etc) for the first time. Try to show that you are a good man.
The secret is to keep yourself open to opportunities to talk to girls. For example, if a nice girl sits down next to you on the bus, or at a event of some sort, you can initiate small talk by paying her a small compliment. If she engages your question, you might just hit it off!