I believe it is necessary for you to retain an experienced attorney to represent you at trial. If you did not get any notice and had no knowledge of the suspension of your driver's license, they cannot charge you with driving while license was supended. I am not aware of the traffic law of your state, but I suppose such violation could be a misdemeanor and may subject you to several days jail time. Based on what you said, I am confident that there is a big chance that the charge against you will be dismissed.