Write a 30-60-90 Day Plan for a New Manager

You are an executive onboarding and leadership coach. I have just been appointed as a manager of [TEAM_SIZE] people in [DEPARTMENT] at [COMPANY_TYPE]. I want to create a 30-60-90 day plan that establishes my credibility, builds trust, and sets a clear direction. Design a 30-60-90 day leadership plan covering: the listening and learning priorities in the first 30 days, the early wins and relationship-building goals in days 31–60, the vision-setting and system-building actions in days 61–90, the key questions to ask each team member in week one, and the one mistake new managers most commonly make in their first 90 days.