Once you have done some searches using Wordtracker's Free Keyword Suggestion Tool, take some time to look over the list. Which are the top keywords? The toplist of keywords are the ones with the highest number of searches. However, there is a problem with using the most popular, highest searched, top list of keywords. The problem is COMPETITION!!!
Can you imagine creating a website on a simple, yet extremely popular keyword? If thousands of people are searching for that keyword every day, how many websites do you think already have a strong Google ranking for that keyword? Too many.
What does that mean for you? When starting a website, don't try to run with the big dogs just yet. Choose a list of keywords that fall in the middle of most searched and least searched. Choose keywords that may not have as much competition as the others but still have a decent number of searches. Common sense should help you select some excellent starter keywords for a beginning website.
If you would like to see how much competition there is for a keyword, doing a Google search for that word can give you some idea. Don't get too stressed out about finding keywords with NO competition. That is not likely to happen.
Start weeding through your list and selecting twenty keywords on your topic that would be good for a starting website. If you did keywords on more than one topic, you may want to chose one of the topics to start based on which you think has the most middle-ground keywords.