Generate a full detail guide on starting a service-based business (e.g., consulting, freelance design). The guide must be highly practical for a solo entrepreneur. It should include detailed sections on: 1. How to Package Your Services: Creating tiered packages instead of just trading hours for money. 2. A guide to writing a compelling project proposal. 3. Onboarding a New Client: A checklist for a successful project kickoff. 4. Managing Client Relationships and Expectations. 5. Strategies for getting testimonials and referrals. Please include a supportive disclaimer.