What kind of documentation? If you don't want to get into it here, PM or phone is culo.
I had to do research on the educational (one of the too school districts in the country) and recreational/athletic (park district) activities that would be available to him in the new place. The judge also wanted to know if i had a job lined up (i didnt at that point, but i was close) and what my support system would be in the new place (childcare, family nearby, etc)