As I write this, 16 AP Psych students have already picked up their textbooks and we are only an hour or so into textbook pick up! Yay!
As students discovered this morning, you will get a copy of your first reading assignment when you come in to pick up the book. In it, there are directions for how to tackle the your first section of reading: the Prologue & Chapter 1.
While you are free to use any method of note taking you choose as you read the textbook, I'd recommend exploring the Cornell method if you haven't already. It's a very effective system that has been shown to improve retention of material (when used for textbook reading or for class lecture notes).
Good luck, and welcome to AP Psych!