Improving SEO of Standard Sites

I have a standard website that is a single page of info.

Texas Gun Ranges is the URL.

Currently I have it linked in my signature as a means of generating linkbacks to the site on several forums that I post on. Is this a positive strategy?

I've included a short keyword based Meta description and the content is low on fluff. It hasn't been on the net for long, and I'm currently on page 4, which is basically excommunication (Google). Ironically I get nearly all of my SE traffic from Yahoo. Doesn't say much, but I guess Yahoo likes my site.

What am I missing out on? Am I just impatient or is there something I can do to improve it's site rank chances?

step 1) [Invalid] Markup Validation of http://www.texasgunrange.com/ - W3C Markup Validator
looks like you built this in excel... the publish to website feature of microsoft products is garbage. the bloat of useless code is killing your code2content ratio.
I'd be happy to clean this up for you and give you an easy template to add new links into for a modest fee. PM if interested.

step 2) incorporate heading tags

step 3) make a sitemap for it. if its only a few pages, just do it by hand