There is no way you can know everything.
Neither can I, but together we know more
Managing IT is one of the hardest management disciplines.
It requires a deep technical understanding and a keen sense for the business possibilities inherent in new technology over and above the normal management skills.
That means, that you have to have spent a long time getting native to the environment,
Besides, your co-workers are a hardy bunch of highly motivated, intelligent and creative individualists. That is part of the nature of IT, but it also means that getting them to march in the same direction is a lot like herding cats.
I have been working in IT since 1960, so if you have the leadership, I can help with the experience.