Regardless of team size, it's common for visual content to be created by nearly everyone except, perhaps, the SEO specialist. While designers will do the bulk of the advanced creative work, bloggers, content creators, and social media managers will all get involved in lighter-weight design. Often, designers will also create templates for the writers on the team so they can be more independent -- like creating ebook templates so premium content can be laid out by just about anyone with an InDesign license.
To explain how content marketing works, we first have to agree on a definition. Unfortunately, I might've sent myself on a fool's errand -- I went through dozens of different iterations of a content marketing definition (including the somewhat flippant "content marketing is using content for marketing") and found none of them totally satisfactory. But I hate to let perfection get in the way of progress, so let's just get something down on paper so we have a basis for discussion:
Part of transitioning to a media publishing mindset requires a change in structure and process to create content at the speed of culture. The old model you see on shows like Mad Men is too slow and cumbersome. By the time an idea becomes an ad, it is out of date. Marketers are increasingly co-locating insights, creative, production, legal approval, and placement to increase interaction and speed in producing and distributing content. Marketing content production is transforming from an advertising agency model to a newsroom model.
Consider a technical writing certificate. Technical writing is a type of content writing that focuses on communicating technical material through manuals, reports, and online documents. This could be a how to guide, a safety manual for a worksite, or a document on a process or procedure. There is a growing demand for technical writers who can explain complex procedures to the average reader.
Practice article writing. Learn how to write a newspaper article and how to write a wikiHow article. As a professional content writer, you may find a position that focuses on journalistic article style writing, or more educational how to writing. Study the form, structure, voice, and tone of each type of article so you are familiar with both types.