What is the consequences of first offense DUI of marijuana?

I was pulled over due to speeding and supposedly swerving through lanes. At the time of arrest I have not smoked since prior to driving. Before the arrest, the cop was questioning me in the car. He asked if I was smoking and driving I replied no, I have not smoked in hours. After he mentioned I can be arrested but assured me I won't. I was never read my rights. If I knew he would use what I say against me I would have not said a word. Few minutes later after finding alcohol in my vehicle he arrested my friend then myself. My friend was arrested for possession of marijuana and alcohol. I told the cop the alcohol was not mine. My friend told the cop it was all his alcohol. Also that day I did not consume any alcohol. After my arrest I was taken to a hospital for a blood & urine test. All in all I was arrested, and ticketed with 4 violations: driving under influence, illegal transportation alcohol, improper lane usage, and speeding 91 mph in a 65 mph zone.