I want to start reading to my child. Any rules? How long should I start reading to her? She is 6 months old. Is it too early to start reading?

Reading can never be too early. You can start this good habit anytime you feel comfortable. However, in order for your child to enjoy reading better do choose books & materials that are suitable for her age. For a 6months old, I love to read cloth books with texture for the baby to explore her sense of touch