When you have a shortlist of potential mentors, you need to reach out to them and express your interest in learning from them. You can send them a friendly email, a LinkedIn message, or a phone call, depending on the context and the level of familiarity. In your initial contact, you should introduce yourself, explain why you are interested in them as a mentor, and highlight what you can offer them in return, such as your skills, enthusiasm, or network. You should also ask them if they are open to having a conversation with you to explore the possibility of a mentoring relationship. If they agree, you should prepare some questions to ask them during the conversation, such as their background, their goals, their challenges, their expectations, and their availability. The goal of the conversation is to build rapport, establish trust, and assess the compatibility between you and the potential mentor.