As a driver, you read drive to win first; and then you hit speed secrets' books simultaneously.
As an engineer, you hit the textbooks first. Then you read Smith's Tune to Win & Engineer to Win. It's been years since I've flipped through the book, but most people will say that is where you start. After that, IMO one needs to pickup Buddy Fey's Data Power (good luck on that btw w/o spending a fortune) and if you feel like you want to dive into vehicle dynamics, the first one you get is Milliken's; there are a few out there but that one is probably hands down the most popular first title. After that if you feel like you want to study tires you read Haney's before Pacejka's.
Notice I haven't even touched on the topic of aero. All the titles above should take you at least a good 18 to 24 months if not more to properly absorb and digest.