I was recently promoted to a middle management position but I have no management training. My team keeps looking at me for direction, but I am just hoping no one notices that I am making it up as I go. How do I go from overwhelmed to confident without totally screwing this up?

I've been in my current role for three years and was recently promoted to a management position, but I'm struggling to get my boss to take me seriously. How do I get my boss to actually listen and see me as a member of management?