When you start a blog you have begun your marketing process to sell more ebooks over time. Blogging is not just about you giving your readers information on your topic; it is about starting a conversation with your readers and with other bloggers. Go to Technorati and search for blogs in your field. This site lists millions of blogs and categorizes them by topic. You will want to claim your blog at Technorati after you have made a few posts. Visit these blogs regularly and comment on posts that are of interest to you. Commenting on other blogs will also give you a link back from their blog to yours, increasing your search engine ranking over time.
You can also sell your ebook directly from your blog. This becomes convenient because you don’t have to set up a separate web site for your sales letter. You can even connect it to your shopping cart so the entire transaction can be done right there on your blog.