To generate a keyword list, WordStream's Keyword Discovery Tool  examines your website's log history and populates your WordStream account with keywords people searched with to land on your site. While this is the best way to find keywords for almost any website, it doesn't perfectly serve those who are about to launch or have just launched their website. If this is the case for you, simply follow the steps below to get started.
What if I Want to Promote a Just-Launched Website With a Search Campaign?
Depending on the age of your website, you may or may not have enough keywords from your history to start promoting your new website with a PPC campaign. If you want more keywords, you can use our embedded version of Google's Keyword Tool . Just click the "Import Keywords" button to load the Import Keywords Wizard. Select the first option to use WordStream's Keyword Suggestion Tool.
This tool functions very similarly to other third-party keyword suggestion tools. Enter a word or phrase to generate a list of popular keywords  related to that phrase:
You can modify the generated keyword list or upload all keywords as is.
For more details on the process of uploading keywords, read our Import Keywords Tutorial .
Keyword Expansion : Growing and Aggregating Your Keyword List