Below post is a summary 4-page article from entrepreneur.com:

As with any business move or expansion, considering an online presence can raise a sometimes dizzying list of questions for an entrepreneur. Exactly what must be put in place to make it happen? How does an online presence change the market for the business? What are competitors doing? How will people shop? What kind of security is required? How will customers pay online? We put together this guide, a primer of sorts, to help answer those questions.