Taking over leadership of a new team where you lack expertise can indeed be a challenging transition. Based on the insights from Ed Batista's work, you can prepare to effectively lead the new team by focusing on the following key areas:

1. Embrace Delegation and Decision-Making Frameworks: Utilize frameworks like Jurgen Appelo's "7 Levels of Delegation" to allocate authority and decision-making power appropriately. Recognize that effective delegation requires managing your emotions and the desire for control. Overcome any discomfort with ceding decision-making by developing self-awareness and addressing any resistance you may feel. [Leadership, Decision-Making and Emotion Management]

2. Transition from Doer to Leader: Acknowledge that the skills that made you successful as an individual contributor may not be the same skills required in a leadership role. As a leader, your role is to guide and inspire rather than to execute tasks. Avoid becoming a bottleneck by trying to do too much yourself. Instead, focus on leading more and doing less, which is crucial as the organization scales. [How to Scale: Do Less, Lead More]

3. Develop a Professional Practice: Leadership is a professional practice that requires dedication and discipline. Recognize that leadership at scale is complex and challenging, and you must commit to continuous learning and development. Engage in regular practices that strengthen your leadership abilities, such as reflection, exercise, and mindfulness. [Leadership as Professional Practice]

4. Manage Your Emotions and Influence Others: Understand the impact your emotions have on your team and cultivate habits that help you manage them. Leadership is a performance where you must inspire confidence and calm in others, especially during times of uncertainty. [Leadership as Professional Practice]

5. Be Strategic and Visionary: Spend time envisioning the future and planning strategically. Develop the skill of bringing others along with your vision without stretching them too far. Balance the foresight of future events with an understanding of current trends and team dynamics. [The Rubber Band Effect]

6. Define Your Role and Prioritize Learning: Clearly define what you are uniquely qualified to do, what you are obligated to do, and what you are free to do. Prioritize learning as efficiently as possible to gain the necessary expertise in your new role. Embrace humility and be open to learning from those who have more experience in the functional areas of your team. [Three Buckets (On CEO Job Descriptions)]

7. Seek Personal Fulfillment: Find aspects of the role that are personally fulfilling to make the leadership position sustainable. Consider small projects or tasks that lift your spirits and provide intrinsic rewards, which can prevent feelings of disenchantment and burnout. [Three Buckets (On CEO Job Descriptions)]

In summary, to prepare for leadership in an area where you lack expertise, focus on developing a leadership practice that emphasizes delegation, strategic thinking, continuous learning, emotional intelligence, and personal fulfillment. This will help you to lead effectively and inspire your team, even in areas where you are not the expert.