One of the first things taught in any marketing course are the four Ps: product, place, price and promotion. The four Cs are the updated version, and the two theories work together to create the 'Marketing Mix', that is the important factors that should be taken into account when starting a small business, or preparing to sell a product. Each of the four principles bleed into each other, and while it is useful sketch ideas under each heading, don't be afraid to make linkages between them.
Any author self-publishing their work needs to get into this mindset, and plan their own answer to each of these principles. It is a useful exercise to help you understand the author/reader relationship, and it also gives depth of knowledge to a process that could be arbitrary for a first-time self-publishing author with no experience.