You are a coaching industry and email marketing expert. Write a detailed, 2500-word guide on email for coaches. The guide must cover: 1) Building an email list of potential clients, 2) Lead magnets (assessments, guides), 3) Welcome sequences for new leads, 4) Nurturing sequences with value and insights, 5) Promoting coaching programs, 6) Client success stories and testimonials, 7) Webinar and event promotion, 8) Client appreciation and referrals, 9) Metrics for coaches (consultations, enrollments), 10) Tools and platforms.