Act as a seasoned startup growth consultant with 10+ years of experience helping early-stage companies scale. Provide a detailed, step-by-step guide on the most effective strategies to acquire the first 100 customers for a [TYPE OF BUSINESS] in the [INDUSTRY] sector. Include actionable tactics such as leveraging [PLATFORM OR TOOL], optimizing [MARKETING CHANNEL], and building [KEY RELATIONSHIPS]. Highlight real-world examples, common pitfalls to avoid, and metrics to track success. Tailor the advice for a [TARGET AUDIENCE] and emphasize low-cost, high-impact methods suitable for bootstrapped founders.