In order to find these keywords You must search google itself because it is free and it is in my opinion the most accurate information when searching for golden keyword opportunities. Go to google and use the keyword suggestion tool witch is free in adwords and do some research. Find the lowest competition in your category and that should do it.
Next you need to have a landing page with good content about your product or service. Make sure your content is accurate and it gives your visitors a good sense of quality in what you are offering because remember good content is key to converting visitors to customers.
To learn step by step google search tips go to http://freeadvertisingforum.com/
