Hi paulo and glad to have you on the forums.
In reply to your questions.
5 x 2k = 10k pace session
6 x 1k = 5k pace session
10 x 400m = 3k pace session
doing the 2k session will develop your 'speed endurance' it is possibly the most important session of the program
you have an opportunity to provide feedback here, so we can guide you through the process of achieving your goals
what are your PB's and what shape are you in currently
what distance are you up to in your long run
do you use a heart rate monitor
over to you