World gurus and top marketing directors acknowledge SOSTAC as a very effective planning system – which you’ll very quickly be able to use again and again whether for business plans, marketing plans or even your own personal life plans. 
The picture shows how to implement SOSTAC model and which questions  wen need to ask. 

Very simply put, eMarketing or electronic marketing refers to the application of marketing principles and techniques via electronic media and more specifically the Internet. The terms eMarketing, Internet marketing and online marketing, are frequently interchanged, and can often be considered synonymous.

eMarketing is the process of marketing a brand using the Internet. It includes both direct response marketing and indirect marketing elements and uses a range of technologies to help connect businesses to their customers.

By such a definition, eMarketing encompasses all the activities a business conducts via the worldwide webwith the aim of attracting new business, retaining current business and developing its brand identity.