Before you go worrying about what sentence you may receive, you need to consult with an experienced criminal defense lawyer. You may have defenses to the search of your vehicle and otherwise. In any event, what sentence you may receive would depend on numerous factors, and your question doesn't even state what offenses you have been charged with.
You left out an important factor: what drugs? Marijuana? Methamphetamine? Cocaine? Heroin? Prescription drugs? The consequences vary greatly.
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