Visitation-- Need some advice

I'm from Oklahoma. I have an 11 year old daughter that I haven't seen since she was 3. Her mom and I were not married. I do pay child support and provide her medical/dental insurance. (Which doesn't get used.) I have tried repeatedly to go through DHS/CSE to request visitation with my daughter and have been told by them that the mom has the right to not allow me to see my child. I have no court order telling me that I can't see her. I don't even know where (town) she lives and DHS refuses to give this information to me. I would like to be able to write her letters, etc. I know if I got visitation at this point, it would need to be supervised and I am fine with that. I just want to see my daughter and don't know where to begin. I have NO money to hire an attorney. Any advice? Can the non custodial parent go through DHS/CSE to get help just like the custodial parent can? Thanks.