David Tainsh has been building sales and marketing systems since 1998, when he launched an online music magazine from a CompuServe CD. For more than 20 years he's been brought into start-ups and early-stage companies to design the systems that bring in customers, usually on tiny budgets with a brief to get into profit fast. He founded A Digital Plan to turn that experience into courses for agencies, consultants and online stores, where every lesson leaves you with a working asset.