When I got my first management post I was given some excellent advice by one of my colleagues:
Firstly - Never do over the phone or by email what you can do face to face;
Secondly - Keep close to your money man (our accountant was a male at that stage - and still is a male last time I saw him!!).
This sage advice has stayed with me for decades and I have passed it onto many people. Even though I work in a highly technical field, my success has been accentuated by the strong face to face relationships I have been fortunate to make with colleagues and clients over the years.