It may sound harsh, but as a first-time manager you'll make mistakes. Studying some of the mistakes commonly made by new managers will help you learn through the experience of others and avoid similar issues.
Becoming a successful manager is not an easy task. It is not only a matter of making the right decisions for your company, but you need to be a good leader. This means that you need to know how to encounter and handle various problems.
Analyzing your audience and the purpose of your message is the key to successful business writing. As well as helping you decide what content and how much detail to include, it helps you apply the right tone in your writing.