The question: If I have technical skills and can build a prototype myself, what sort of skills or experience should I look for in a business co-founder? Is it

The question: If I have technical skills and can build a prototype myself, what sort of skills or experience should I look for in a business co-founder? Is it marketing experience? Salesmanship? A large network? What are the most important things I will need in order to turn my app into a business?