What do I do if I have multiple charge and a plea offer?

I was arrested and was charged with the following: 893.13.6a Possession of a controlled substance, 893.147.1 Possession of drug paraphernalia and 316.193.1 DUI. What happened was a deputy found me passed out in my car in a parking lot while my car was running. They asked me if they could search the vehicle and my pocketbook and I said yes. They found some Benzes that were not prescribed to me in my pocketbook, along with a cut straw. My court appointed lawyer said they would offer me a plea deal for 3 year probation but that I shouldn’t take it because they have no evidence. They took the pills from me when I was arrested. They were in an unmarked bottle and were not prescribed to me. What happens now if I do not take the plea? My court appointed lawyer is not telling me much. Will this go to trial? I don’t know what I should do now! If the prosecutor really does not have any evidence, will they throw the case out? I took a urine test when I was arrested but nobody seems to know what the results are. The breath test came up at zero for alcohol.