Act as a seasoned startup growth strategist with 10+ years of experience in developing high-impact partner programs. Guide me step-by-step on how to build a scalable and mutually beneficial partner program for [YOUR INDUSTRY] startups targeting [TARGET AUDIENCE]. Include key elements like [PARTNER TIERS], [INCENTIVE STRUCTURES], and [ONBOARDING PROCESSES]. Provide actionable insights on how to attract top-tier partners, measure program success through [KPIs], and avoid common pitfalls. Tailor your advice for early-stage startups with limited resources but ambitious growth goals.