You type in a word. Fill out the captcha. Click "search". Look at the list of words. Find ones that are relevant to your niche that have a competitive rating that you think you can compete with. Optimize your site for those words. Build links.
Go to the Google Keywords Tool. Type in the queries that best match or describe your business/product/website. You will get a list of SEARCH QUERIES (these are what people use to search something on Google) the one with the HIGHEST number of searches is a best choice for you, keep trying a few keywords to see which is searched for the most. Normally, a person has a good idea of the product in mind but doesn't call it in the way others do. So this is what you're trying to find out and at the same time you want to see which keywords are in highest demand. With that sorted, you want to have these keywords as much as possible integrated into your website so that search engines know what your website is talking about and this will get you a decent search engine exposure given you practice the right SEO Techniques and Link Building Techniques.
Be vary careful about relying too much on this data from the Google Keyword Adwords Tool. Number can way off. If you want real numbers, run a small Adwords campaign and look at the impression numbers of your ad based on keyword.
type the keyword in Google adword keyword tool. It gives relevant keywords term with Global & local monthly seraches