The kids have graduated to U12 soccer so they are either playing on an 8v8 field or an 11 vs 11 field. The kids will need to continue to work on the following aspects of soccer.
The kids will be working on a bigger field with larger numbers on the field with more ground to cover so all the work done on the smaller fields will help them tactically.
My goal when moving from the smaller game to the bigger field is to make the transition as easy as possible for the players from a skills, tactics and fitness stand point. From a skills stand point the bigger field presents some more challenges.
We have been priming the kids and teaching them all kinds soccer skills. The U12 soccer player will need skills like...
The kids should have a pretty good foundation if they have been working on all their soccer skills. Especially, if they have been playing since U6.
They should be able to hit a good pass and play some combinations like a give and go.
The players should be able to use the different surfaces to control the soccer ball like the instep - thigh or chest.
The players should have a good understanding of how to strike the soccer ball with the instep.
These are all basic skills the players will need when starting to transition from the 8 vs 8 game to the 11 vs 11 game.
Here is a practice session combining speed and agility and soccer skills...
The next area where players will need some help is moving from 8v8 to 11v11 because there will be 3 more players on the field.
What system should the coach play? Players to a system or system to the players?
I am not going into an in depth analysis on 11 vs 11 soccer tactics here because this site is dedicated to the kid soccer player, playing small sided soccer games. Here is a great example of a U12 soccer practice!
Keep it simple!