What should I do regarding a DUI/Controlled Substance case?

Question Details: I was arrested and had possession of control substance, open container and a BAC double the legal limit. I rammed my vehicle into a railing on the parkway and was not conscious enough to stop and report it and gained consciousness at the police station. This would be my second DUI in 2 years and I dont know what to do. I was offered a opportunity by cop to help with the criminal side of the incident if I "helped them out" but I dont know how much it will help my case if I proceed. I cannot afford a lawyer so I am pretty clueless if I should take the opportunity I was given if it will help my case. I need guidance on what to do. I don't mind taking the controlled substance charges to be honest, I just want to avoid losing my license for 2 whole years or more. I understand it's a wrong decision I've made and am willing to live with it. Any information that can guide me on what my options are would be great.

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