Start with the basic FAQ and put that directly into your website. We generated thousands of visits per month due to our extensive Knowledgebase from inside WHMCS (or Kayako). When I say extensive, we had over 1,000 "how to" steps.
Every time a customer asked a question, if we felt it would be asked again, we wrote a how-to.
My advise, put the effort into your own site directly rather than on other websites.