What are the key qualities and skills I should look for in a virtual assistant to ensure they align with my business needs? How can I effectively assess a virtual assistant's communication skills and work style during the interview process? Can you provide guidance on setting up a structured onboarding and training process for a new virtual assistant? What strategies can I use to maintain a productive and engaging working relationship with my virtual assistant? How should I set and manage expectations and performance metrics for a virtual assistant to ensure accountability and high-quality work?