Nice, very nice. You are well on your way I can see. A clear topic and a consistent style.
In Firefox on Windows, some of your ads, in the bottom of the sidebar, are too big or the sidebar to narrow.
I can see you are using multiple categories for each post, from a seo point of view, it’s bad. It’s the way to double content, and you don’t want that.
One categori pr post, and multiple tags is the way to go. To many similar categories is also not good.
You need the WordPress SEO by yoast plugin, it’s a little complicated, but it’s the best af its kind. All SEO plugins are a little complicated.
And then go to the plugin homepage and take the time to read, you will learn a lot.
SEO is a constant and ever changing thing, but those guys have you covered, and it’s free.
There is this guide to WordPress SEO at wpcube.com. Read that too. You will find a lot of usefull WP stuff at this blog.
$99/month is robbery for a blog at the size of yours, and yes it’s better to learn your self, you will use seo every time you write a post or make a page.