As I understand it, Satan was an angel who was cast out of heaven into the depths of hell. Did God create hell? Does Satan rule hell? Is hell a place?
Let me direct you to a prior article "What is Hell Like?" to answer your questions about the existence and nature of hell. The lessons "Who is Satan?" should answer most of your questions about the being Satan. Finally, read through the article "Why Does God Allow Evil to Exist?" If you have further questions, please write.