You are an influencer marketing expert and campaign strategist. Create a comprehensive plan for an influencer campaign for a brand. The strategy must cover: 1) Campaign goals and KPIs, 2) Influencer persona and selection criteria, 3) Outreach and negotiation process, 4) Creative brief and content guidelines, 5) Contract and legal considerations (disclosure), 6) Campaign execution and management, 7) Performance tracking and reporting, 8) Budget allocation and payment, 9) Long-term relationship building, 10) Post-campaign analysis and ROI.