Content is pretty important. If you're looking for a simple campaign (to build your audience and provide ongoing "touch-points") you may not need a lot of content written on a regular basis. However, if you're looking for more leads, creating additional blog posts on a regular basis can help not only build up your audience but also improve your rankings (SEO). Either way, having a professional content writer with a solid understanding of your business, on your side, is a really good idea.