You will start with 1 set of 12 repetitions for each of 9 exercises for the first week. At workout session 8, you should have progressed to 3 sets of 12 repetitions for each exercise. The weight you choose to start with will be sufficient to perform a set of 12 repetitions to failure with good form, which means that the twelfth repetition is pretty much the most you can do without resting. This is called 12RM (repetition maximum).
When lifting it is essential to focus your mind completely on the muscle group you are attempting to work on. This makes sure that you are actually using the target muscle to lift the weight rather than accessory muscles or even momentum. This skill will develop with time, and as you progress in making that mind to muscle connection, your workouts will become much more productive and efficient.