[Geee]

I wouldn't co-found with a business person (whatever that means). You need as many people as possible who actually make the product (developers and designers), and someone who is passionate about solving problems in a particular domain and talking to customers (a product manager). Sometimes these roles are just one person, sometimes two or three. Sales & marketing can be handled by the same team or hired for. You can hire sales people with existing networks if that is needed. I think that if one person can handle all of these roles, he should.