The Immigration Advocates Network (IAN) is a collaborative effort of leading immigrants’ rights organizations designed to increase access to justice for low-income immigrants and strengthen the capacity of organizations serving them. IAN promotes more effective and efficient communication, collaboration, and services among immigration advocates and organizations by providing free, easily accessible and comprehensive online resources and tools.
They house many manuals & examples meant to train lawyers representing immigrant children in the US.
Their resources are walled off — you have to apply to get access to the resources they provide to non-profits and pro bono attorneys.