Start by identifying your SEO needs and goals. Then, you can start searching for candidates on various platforms - job boards, LinkedIn, freelance platforms, or through an agency. Look for candidates who have the right mix of experience, skills, and knowledge as per your needs. Once you have a shortlist, conduct interviews to assess their expertise and cultural fit. Ask them about their previous work, strategies they have implemented, and results achieved. You can also request case studies or references. For final candidates, consider giving them a small, paid project to evaluate their skills practically. Finally, discuss terms, deliverables, and set clear expectations before bringing them on board.