Tennis sisters Serena and Venus Williams have written a book for preteens with advices on such topics as money and dating. The main recommendation is : don’t rush a crush.

 "We both really have a lot to say about that," Venus Williams said with a laugh.

The book is titled: "Venus and Serena: Serving From the Hip: 10 Rules for Living, Loving, and Winning," and targets the 9-12 year old public.

"It's a great book for teenage girls who deal with different issues," Serena Williams said. "Growing up, I would have loved to have had such a positive role model to look up to and try to be like and try to emulate. We love having that opportunity to say, `Look, you can be like us, you can be successful and at the same time have high morals and high self-esteem and be a very nice person at the end of the day.'"

Serena and Venus have written the book in the co-work with Hilary Beard. Currently they are staying in Key Biscayne for the Nasdaq-100 Open.