Use your blog as a media campaign, will be more effective if you do not just fill your blog with ads alone, imagine if you are a visitor, surely you would feel annoyed if you only see a blog that only contains the ads and you certainly will not visit back to the blog.
If you want your business blog, look more professional. You can use a CMS (Content Management System) like WordPress which has many templates that can help you design your blog to make it more interesting.
Or you can use free blog services like blogger who is also often used to promote products. The thing to remember is the target marketing of your blog, so you can build your marketing blog.