Little 8 is the change of circle with the corner players.
Middle build-up indicates which system is started. At small 8 the corners and circle start running;
The right corner takes the initiative and runs towards the position of the circle (can be with or without ball!), the circle runs towards the corner and perhaps takes a defender with it. This may free up the circle which can be played through the build-up. If not, the substitute moves on to the other corner, until either a goal is scored or everyone is back in his/her own place.
Important is watching each other's timing, not getting in each other's way and correct passing with bounce by the builder.
Practice start with passive defenders, then active