I need help for writing my statment of purpose. I don't know how to deal with. Someone can find for me some samples. thanks

Did you try the board search already? Here are some useful posts about how to write the SOP:

http://www.llm-guide.com/board/6200
http://www.llm-guide.com/board/6451

This link may be of help, too:

http://www.accepted.com/law/PersonalStatement.aspx