This phase is the key time for development of a player, as this is where the children obtain fundamental skills in learning of the game. No amount of fitness compensates for the importance of this area of learning.
A link to the Skill Acquisition Manual, can be found below, this is a useful tool which can be referred to for the 9 to 12 age groups.
hosted/org/286/docs/5cc59035/Skill%20Acquisition%20Manual.pdf