Doing Keyword analysis
1) Which business you would like to do.
2) What service you would like to provide to your customer.
3) Who are your targeted customers or visitors?
4) Expected information your visitors may search for?
5) Which information can make them satisfied?
6) Which particular word can be the one word definition for the above mentioned two questions?
7) Now use inventory.overture.com or word tracker.
Search the specific keyword in yahoo, or in Google suggest lab you will get few mores very competitive keywords. That will also help you to targeting more specific keywords.
9) Do some competitor analysis and try to find out which keywords they are using and why, that will also be a big help for you.
10) Last but not the least, use search engines to get your query cleared.
Hope these will help you.
Thanks.