Krishna appears in many complicated stories. Sometimes he is a child, and sometimes a flute-player who calls people's souls, and sometimes he is involved in love affairs with Hindu goddesses, and sometimes he is a great leader.
One important appearance of Krishna is in the Bhagavad Gita, where he is the god who tells the young prince how to act, and generally what is good and what is bad.
To find out more about Krishna, check out these books from Amazon.com or from your local library:
Little Krishna, by Harish Johari (2002). Krishna's childhood, retold for kids with illustrations. There are lessons for everyone in Krishna's close relationship with his mother.