Typically, the easiest starting place is with a focused blog that you contribute new content to frequently. The flipside would be to create one thought-provoking thought leadership piece (whitepaper, ebook, etc.) that you can use to drive traffic to and show your expertise.

Another route is to purchase a highly-targeted email list of people in your target audience and use that list to push content to via email. That would be a quicker way to get a large number of eyes on your content, as opposed to (or in addition to) starting from scratch with a new blog and relying on people to find it via search. But there are some obvious pros and cons of purchasing a list.

That being said, a lot of this will depend on your business and what your goals are. If you're interested in chatting about this, let me know. Newfangled (the company I work for) offers a lot of content marketing consulting, so we can likely get you moving in the right direction.