With treatment many people, particularly with mild COPD, lead a normal or near to normal life.
Most continue in their employment as normal. However if your job entails very heavy manual work, working in a dusty/smoky environment you may have to have certain adjustments made in your work area.
There is no restriction for driving your own car unless you have severe attacks of breathlessness which could cause fainting/dizziness. You would then need to discuss this with your doctor/nurse.