You can find a great deal of sites that feature Chinese astrology online, for example this one. Due to the fact that it has been around since ancient times, it is one of the most popular forms of astrology in the world. There is so much that you can learn about it from those that have come before you.
One thing is that like many other forms of astrology, it does have 12 signs, but instead of constellations or mythical figures, it uses animals as a form of representation. The animals used are the rabbit, snake, dragon, horse, rat, pig, ox, goat, tiger, monkey, dog and rooster.