I am not 'sold' on the benefit of adding an actual blog. The others are correct in that Word Press makes it easy; but why not just set up part of your site as your 'blog'. Add a quick 'Contact' form for people to post comments. That way, you get the e-mail and decide what to post. Not trying to be sneaky, but I have seen some 'not so busy blogs' that get swamped with junk links to adult sites and pharmacy sites.
Besides, the articles and content you add to your website will help a lot with respect to long tail search. I am more inclined to add content, then add more content and more, and let the long tail search grab the visitors.
The other thing that I think is FAR more important (and I didn't see on your site) is that you're not collecting e-mail addresses. Your product/service is something that could include an entire host of additional (back end) products or services. Why are you doing that??
Look at it this way. If a visitor gets to your site, they are a qualified prospect. Otherwise they wouldn't be there. By that, I mean they have SOME interest in what you're selling.
Now, your only job is to give them some reason to sign up to your newsletter. At that time, continue to feed them information. You establish yourself as the expert in your field. You build relationships. THAT'S how you make a profit online. The money is in your list. Just be sure you're not making mistakes when you do that. Have a look at what you need to do to get your business making a profit online
. We've done it for years.. and haven't missed a meal!
Hope this helps! Good luck!