If you want to search the keywords of website, you have to gone through the Google keywords tools for keywords research and also analyse the competitors and monthly search in keywords toolbars according to website business.
You're going to have to go for the long tails if the comp is high. Once it's established, you will be able to go after some of the more competitive ones. Stay targeted now, go broad later.
Try google Adword keyword too it will help to to create new keyword and also help you to know about keyword search traffic.. make long keywords and effective ones.