To get you started fast we have put together this quick Getting Start Guide.
This is broken down into the following areas:
Pay Per Click (PPC) is an Internet advertising model used on search engines, advertising networks, and content sites, such as blogs, in which advertisers pay their host only when their ad is clicked. Advertisers typically bid on keyword phrases relevant to their target market and pay that amount for each click generated
Good Keywords v2:
MSN Demographic Prediction
Miva Keyword Tool