If your audience largely consists of people who search for products in the newspapers, offline advertising might be more suited to your purpose.
If target audience does not use internet, then starting a blog will just be a huge waste of time and effort.
If you are ready to put in the time and effort, your blog will serve as a good branding tool for your business. There are a lot of things that a blog can do for your business.
You have to decide which platform will best meet your marketing objectives, time constraints and personal preferences before you make your first post. If you are short of time, and want to spend more time on writing, then a hosted solution like Blogger, Blogware, Squarespace or Typepad might serve your purpose better. If on the other hand, you want to have a customized blog, then a server-installed software, like Wordpress, b2Evolution or Movable Type might be just right for you.
The blog role in boosting your business can be ascertained by measuring your blog traffic and track sales leads that have come through blog.