Don't pay anything, and make an impact right away with a sharing and rich community of users. Choose something like tumblr, which is perfect, for all types of blog posts about that subject. You can convert to a .com of your choosing, or just start with the tumblr/username format.
It won't cost you a penny, and you can jump start your business with the interactivity and engagement that the site offers. Instead of starting a wordpress blog in the wild and waiting weeks before you get your first visitor, then weeks before the second! lol