I recently found the attached trademark guide in the Cooley trademark vaults. It answers the questions (i) What is a trademark, (ii) Choosing a strong trademark, (iii) Availability and name searches, (iv) Filing and prosecuting US and foreign trademark applications, and (v) brand policing and enforcement.
I hope people find this helpful. You can download the guide here: Trademark Basics
Hat tip to my trademark partner Anne Peck for providing.