This can be as simple as putting a message on your own blog.

Promoting it to your audience and potential clients is what I suspect you need some support with from reading between the lines of your question.

Firstly I would start with the top 10 questions your existing clients ask you.
This will form the basis of your own content inbound marketing - it will also start to set you as the authority.

Video case studies will work extremely well before & after style

Armed with this new information you can promote this to you network - email - facebook - twitter - linkedin - etc.

You might also want to use paid solutions which you can start for a few dollars a day to generate exposure for what you do.

What markets...? A better question might be who do you want to work with..? What types of businesses interest you?

When you have that info you can literally drop your awesome content in front of them with the type of advertising and targeting that is available to everyone.

Good luck