You should have 2-3 main keywords and 9-10 relevant key words or phrases. It's very simple...do your normal keyword serach (I use Google) and then when you find what you want, the relvant keyword search is CRUCIAL. Here's why...google doesn't want over stuffed keywords...it's spamming your own site. They want relevant content, so go to google and in the search type ~ before you keyword. Anything that is bold will be a relevant word you should add. Remember you need 9-10 relevant key words or phrases.