Abuse problems with my Dad, and help on how to handle it...?

Does your mother know about this? If not she should be told, any chance you get I would recommend telling authority because this is child abuse and is a horrible thing for anyone to deal with whether you're family or the one being abused. Talk to a school counselor and ask for them not to tell your father or mother you told them but that they've been seeing signs and they should confront higher authority or your father.