Ask about their experience with businesses like yours. Inquire about their approach to SEO and SEM strategies. Request examples of past success stories. Ask how they choose keywords for campaigns. Clarify their methods for measuring campaign performance. Confirm if they provide regular performance reports. Ask about their approach to staying updated with industry changes. Check if they follow ethical practices in their work. Understand their pricing structure and contract terms. Ask how they handle communication and client feedback. Verify their knowledge of tools like Google Analytics or Ads. A qualified vendor should provide clear and confident answers.