I would just use Adwords like you already seem to be doing. Keep in mind you will most likely get better, relevant and more cost effective traffic from specific longtail keywords. I would make sure that your most important keywords be in your title, then next set of important keywords be in your meta tags and website content. As you are building links I would make sure that your inbound link anchor text is identical to your chosen keywords for maximum effect.
As for what keywords are the best, I would do a quick google search for that, what I remember Arizona DWI and Mesothelioma were top paying keywords but it's an always changing environment.
Good Luck!
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