Hello! There’s actually a very detailed post on this forum that explains exactly how to make the victims. You can find it here:
This guide provides complete instructions for building victims that match competition standards. You can also find the same guide in the official documents section of the community website at Documents | RoboCupJunior Rescue League in the Rescue Line section.
I also recommend checking out the community website regularly, as it has lots of useful resources and updates.
Best of luck with your practice field and the whole journey ahead!