Deep Keyword Research for SEO

Google Keyword Tool.

It is the only tool you need to do this research. Make sure you select exact match and use only the local search numbers.

It is free and the most accurate tool out there.

So how do I approach that to find the keywords?

Stick in my main term "Orthodontist" and export the keywords and run them each individually?

There are more ways to do this,but I guess you're looking for a free solution.
In this case,you can use a free combination of tools like GKT to find long tail and related keywords and also arrange them by traffic.
You can also get a free scraper for google suggest,but if you're just starting out,i suggest you do everything manually and don't get yourself into too many variables.

After you done that you can get a free edition of Traffic Travis and analyze the Seo Competition.This tool should give you an idea on how hard would be to rank for thous terms.

After you got your winning keywords,i advise you take each site that's on page 1 for your keyword,and analyze the link profile using aHref (free edition again) .

This way,you should get a pretty good idea on how competitive a search term is.
Also,as someone above suggested,your brain is the best tool available,so try and think what your possible leads would search for online.

Hey oneano,

Like a few others have mentioned, the Google Adwords Keyword Tool is really the only tool you'll need.

It sounds like you already have a very specific niche in mind. For location specific keywords like that there are only going to be a few variations that are getting decent traffic. So, I would put less weight on how much competition there is and just worry about whether or not there is enough search volume to suit your goals. Local competition has always seemed to be relatively low in my findings anyway.

You'll want to pay attention solely to the "Local Search Volume" and "Exact" match type within the Google Keyword Tool to see how many people are truly searching that exact term in that specific location.

Also keep in mind some States have similar city names, so a term like "Riverside Dentist", while you may mean Riverside, CA, would most likely show inflated search numbers in the GKT because there is also a city named Riverside in NY. The person searching will see personalized results to their area, but as far as "Local Search Volume" in the Google Keyword Tool, Local would mean to your specific country (the whole United States). Just something to keep in mind, hope that's not too confusing.

Thanks,
Chris