Choosing right keywords for your web site will mean success or failure of your business
Start with the free tools
Choosing right keywords for your web site will mean success or failure of your internet advertising efforts
I recommend: Start with
Overture tool
Google AdWords Estimator
Keep an eye for recommended keyword that you haven't though of
I recommend: Google AdWords Estimator
Wordtracker
Use paid tools to collect more data
I recommend: Wordtracker
MSN AdCenter
Majors search engines have keyword research tools
I recommend: MSN AdCenter
KeywordDiscovery
This tool combines few of the tools mentioned above into one place
I recommend: KeywordDiscovery
SEO 1st step already too confusing?
Then hire proficient SEO firm. Look for some credentials, like certified by major SEO firm, certified by major search engines, or belonging marketing organizations.
I recommend: Atlanta Search Engine Optimization firm