My family introduced me to a girl who only had a phone number and had never met before. How to send a message for the first time to get a girl's favor?

First, you should introduce yourself, and then convey your family's affection for her. I'm sure she'll like listening, then learn about her hobbies, and then talk to her with different strategies. Generally, girls' psychology changes rapidly and remains unchanged, so it is better to start directly. Know her basically. Go further. But don't keep thinking about her, contact her. If it is too frequent, it will make her feel very upset. It is better to make her appetite open than to upset her. Girls have a strong vanity. As long as the opposite sex likes them, no matter what they say, they will still be secretly happy. If your looks are also very advantageous, then things will get twice the result with half the effort.