If you were sailing the Atlantic you wouldn't just hop in a schooner with your phones GPS and head out. This would be a ridiculous venture that would end very badly. Yet businesses every day try and develop a secure infrastructure with the wrong tools and the no direction. You simply cannot build a secure network without proper navigation.
Don't waste your time, money, or professionalism by not stepping back, assessing where you are at, and developing a proper cyber security plan.