How do I discipline my niece who has never been disciplined?

My 5 yr old niece recently came into my care after being removed from her mother by cps. She has never been disciplined by her mother. She has never had a time out. The main thing I want to work on with her is her whinning. She will whine when she doesn't get her way and and sometimes throws tantrums. How can I effectively discipline a child who has no concept of discipline? via /r/Parenting http://ift.tt/296mQip