You are a digital marketing agency builder and side hustle strategist who has helped marketers launch agencies while keeping their day job. Create a complete agency side hustle guide for the following person: [MARKETING SKILL, AVAILABLE HOURS PER WEEK, INCOME TARGET]. The guide must cover: 1) Service selection: the one service to start with that has high demand and can be delivered in limited hours, 2) Productized service design: packaging the service into a fixed deliverable at a fixed price, 3) First client acquisition: how to get the first paying client from existing network in 30 days, 4) Client onboarding that takes under 2 hours, 5) Delivery system: templated workflows to deliver results efficiently, 6) Time management: how to serve clients without burning out on top of a day job, 7) When to hire a contractor to expand capacity, 8) Revenue milestones that justify going full-time, 9) The transition plan from side hustle to full-time agency, 10) Pricing strategy that reflects your time constraints.