Asking questions is an important part of getting to know someone. Be polite in your approach and avoid the topics that make the person feel uncomfortable. Religion, politics and previous relationships are some of the things you should be careful with. They sometimes may cause misunderstandings and even conflicts. Ask neutral questions.
How focused are you? Make sure you know what kind of people you are interested in and do not waste your time and emotions on those who you know will never make your perfect match. Be friendly even if you feel the person will never become part of your life.