Absolutely read the guides here on cc silverturtle, Xiggis and other info at the top of this forum page. They are the stickied posts so they always stay on top. Also, the template on how to write a 12 essay in 10 days. Good luck!
One suggestion for using the Collegeboard book. The first 3 tests are real retired SAT tests. Save doing those three for a true practice test after you have done some of the others so you can see what your actual score would be. The other 7 give you a score range for the #right you got, not a single score.